diff --git a/.github/actions/setup-javascript/action.yml b/.github/actions/setup-javascript/action.yml
index 7982c17d61..3c9e06116c 100644
--- a/.github/actions/setup-javascript/action.yml
+++ b/.github/actions/setup-javascript/action.yml
@@ -23,7 +23,7 @@ runs:
       shell: bash
       run: echo "dir=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT
 
-    - uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+    - uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5
       id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
       with:
         path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
diff --git a/.github/workflows/build-container-image.yml b/.github/workflows/build-container-image.yml
index 07669a574c..595011a0c6 100644
--- a/.github/workflows/build-container-image.yml
+++ b/.github/workflows/build-container-image.yml
@@ -35,7 +35,7 @@ jobs:
           - linux/arm64
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Prepare
         env:
@@ -100,7 +100,7 @@ jobs:
 
       - name: Upload digest
         if: ${{ inputs.push_to_images != '' }}
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           # `hashFiles` is used to disambiguate between streaming and non-streaming images
           name: digests-${{ hashFiles(inputs.file_to_build) }}-${{ env.PLATFORM_PAIR }}
@@ -119,10 +119,10 @@ jobs:
       PUSH_TO_IMAGES: ${{ inputs.push_to_images }}
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Download digests
-        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
         with:
           path: ${{ runner.temp }}/digests
           # `hashFiles` is used to disambiguate between streaming and non-streaming images
diff --git a/.github/workflows/build-push-pr.yml b/.github/workflows/build-push-pr.yml
index 3952ed0a0b..ead1ecd082 100644
--- a/.github/workflows/build-push-pr.yml
+++ b/.github/workflows/build-push-pr.yml
@@ -18,7 +18,7 @@ jobs:
     steps:
       # Repository needs to be cloned so `git rev-parse` below works
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - id: version_vars
         run: |
           echo mastodon_version_metadata=pr-${{ github.event.pull_request.number }}-$(git rev-parse --short ${{github.event.pull_request.head.sha}}) >> $GITHUB_OUTPUT
diff --git a/.github/workflows/bundler-audit.yml b/.github/workflows/bundler-audit.yml
index c9ceb8fcab..f3a97f8a2e 100644
--- a/.github/workflows/bundler-audit.yml
+++ b/.github/workflows/bundler-audit.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@09a7688d3b55cf0e976497ff046b70949eeaccfd # v1
diff --git a/.github/workflows/bundlesize-compare.yml b/.github/workflows/bundlesize-compare.yml
index 1651f5cdae..d1b91aed96 100644
--- a/.github/workflows/bundlesize-compare.yml
+++ b/.github/workflows/bundlesize-compare.yml
@@ -17,7 +17,7 @@ jobs:
     env:
       ANALYZE_BUNDLE_SIZE: '1'
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
@@ -26,7 +26,7 @@ jobs:
         run: yarn run build:production
 
       - name: Upload stats.json
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: head-stats
           path: ./stats.json
@@ -40,7 +40,7 @@ jobs:
     env:
       ANALYZE_BUNDLE_SIZE: '1'
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           ref: ${{ github.base_ref }}
 
@@ -51,7 +51,7 @@ jobs:
         run: yarn run build:production
 
       - name: Upload stats.json
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: base-stats
           path: ./stats.json
@@ -64,9 +64,9 @@ jobs:
     permissions:
       pull-requests: write
     steps:
-      - uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5
+      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
 
-      - uses: twk3/rollup-size-compare-action@5d3e409fcfe15d8ebb0edfe87e772c04b287f660 # v1.0.0
+      - uses: twk3/rollup-size-compare-action@a1f8628fee0e40899ab2b46c1b6e14552b99281e # v1.2.0
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           current-stats-json-path: ./head-stats/stats.json
diff --git a/.github/workflows/check-i18n.yml b/.github/workflows/check-i18n.yml
index 9ba0ddf3f7..6d660ec5bf 100644
--- a/.github/workflows/check-i18n.yml
+++ b/.github/workflows/check-i18n.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
diff --git a/.github/workflows/chromatic.yml b/.github/workflows/chromatic.yml
index 411f5ef02d..19548c28c1 100644
--- a/.github/workflows/chromatic.yml
+++ b/.github/workflows/chromatic.yml
@@ -16,7 +16,7 @@ jobs:
       changed: ${{ steps.filter.outputs.src }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
 
@@ -42,7 +42,7 @@ jobs:
     if: github.repository == 'mastodon/mastodon' && needs.pathcheck.outputs.changed == 'true'
     steps:
       - name: Checkout code
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 9f538d0787..4e55219f55 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/crowdin-download-stable.yml b/.github/workflows/crowdin-download-stable.yml
index 0597a2373b..0c1f15efed 100644
--- a/.github/workflows/crowdin-download-stable.yml
+++ b/.github/workflows/crowdin-download-stable.yml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Increase Git http.postBuffer
         # This is needed due to a bug in Ubuntu's cURL version?
@@ -51,7 +51,7 @@ jobs:
 
       # Create or update the pull request
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e # v7.0.8
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8.1.0
         with:
           commit-message: 'New Crowdin translations'
           title: 'New Crowdin Translations for ${{ github.base_ref || github.ref_name }} (automated)'
diff --git a/.github/workflows/crowdin-download.yml b/.github/workflows/crowdin-download.yml
index 6c96630b47..9a07e0593b 100644
--- a/.github/workflows/crowdin-download.yml
+++ b/.github/workflows/crowdin-download.yml
@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Increase Git http.postBuffer
         # This is needed due to a bug in Ubuntu's cURL version?
@@ -53,7 +53,7 @@ jobs:
 
       # Create or update the pull request
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@22a9089034f40e5a961c8808d113e2c98fb63676 # v7
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8
         with:
           commit-message: 'New Crowdin translations'
           title: 'New Crowdin Translations (automated)'
diff --git a/.github/workflows/crowdin-upload.yml b/.github/workflows/crowdin-upload.yml
index 815018199f..d31272dc75 100644
--- a/.github/workflows/crowdin-upload.yml
+++ b/.github/workflows/crowdin-upload.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: crowdin action
         uses: crowdin/github-action@b4b468cffefb50bdd99dd83e5d2eaeb63c880380 # v2
diff --git a/.github/workflows/format-check.yml b/.github/workflows/format-check.yml
index 0177f1c271..528813c73a 100644
--- a/.github/workflows/format-check.yml
+++ b/.github/workflows/format-check.yml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/lint-css.yml b/.github/workflows/lint-css.yml
index 9f9edba3f7..178342ed34 100644
--- a/.github/workflows/lint-css.yml
+++ b/.github/workflows/lint-css.yml
@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/lint-haml.yml b/.github/workflows/lint-haml.yml
index 2abe2e96d9..637c211700 100644
--- a/.github/workflows/lint-haml.yml
+++ b/.github/workflows/lint-haml.yml
@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@09a7688d3b55cf0e976497ff046b70949eeaccfd # v1
diff --git a/.github/workflows/lint-js.yml b/.github/workflows/lint-js.yml
index 705c28a12e..7036c5e569 100644
--- a/.github/workflows/lint-js.yml
+++ b/.github/workflows/lint-js.yml
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/lint-ruby.yml b/.github/workflows/lint-ruby.yml
index 7fc1371c18..c70e2ede05 100644
--- a/.github/workflows/lint-ruby.yml
+++ b/.github/workflows/lint-ruby.yml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@09a7688d3b55cf0e976497ff046b70949eeaccfd # v1
diff --git a/.github/workflows/test-js.yml b/.github/workflows/test-js.yml
index c85754fd2f..d1b55a5e0b 100644
--- a/.github/workflows/test-js.yml
+++ b/.github/workflows/test-js.yml
@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Clone repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
diff --git a/.github/workflows/test-migrations.yml b/.github/workflows/test-migrations.yml
index 03a7dcc44a..f33bf981cc 100644
--- a/.github/workflows/test-migrations.yml
+++ b/.github/workflows/test-migrations.yml
@@ -72,7 +72,7 @@ jobs:
       BUNDLE_RETRY: 3
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
diff --git a/.github/workflows/test-ruby.yml b/.github/workflows/test-ruby.yml
index decfc7ef47..97d7cf1800 100644
--- a/.github/workflows/test-ruby.yml
+++ b/.github/workflows/test-ruby.yml
@@ -32,7 +32,7 @@ jobs:
       SECRET_KEY_BASE_DUMMY: 1
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
@@ -43,7 +43,7 @@ jobs:
           onlyProduction: 'true'
 
       - name: Cache assets from compilation
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5
         with:
           path: |
             public/assets
@@ -65,7 +65,7 @@ jobs:
         run: |
           tar --exclude={"*.br","*.gz"} -zcf artifacts.tar.gz public/assets public/packs* tmp/cache/vite/last-build*.json
 
-      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         if: matrix.mode == 'test'
         with:
           path: |-
@@ -128,9 +128,9 @@ jobs:
           - '3.3'
           - '.ruby-version'
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
-      - uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
+      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
         with:
           path: './'
           name: ${{ github.sha }}
@@ -151,7 +151,7 @@ jobs:
           bin/flatware fan bin/rails db:test:prepare
 
       - name: Cache RSpec persistence file
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5
         with:
           path: |
             tmp/rspec/examples.txt
@@ -222,9 +222,9 @@ jobs:
           - '.ruby-version'
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
-      - uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
+      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
         with:
           path: './'
           name: ${{ github.sha }}
@@ -247,7 +247,7 @@ jobs:
 
       - name: Cache Playwright Chromium browser
         id: playwright-cache
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5
         with:
           path: ~/.cache/ms-playwright
           key: playwright-browsers-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
@@ -263,14 +263,14 @@ jobs:
       - run: bin/rspec spec/system --tag streaming --tag js
 
       - name: Archive logs
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         if: failure()
         with:
           name: e2e-logs-${{ matrix.ruby-version }}
           path: log/
 
       - name: Archive test screenshots
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         if: failure()
         with:
           name: e2e-screenshots-${{ matrix.ruby-version }}
@@ -360,9 +360,9 @@ jobs:
             search-image: opensearchproject/opensearch:2
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
-      - uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
+      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
         with:
           path: './'
           name: ${{ github.sha }}
@@ -382,14 +382,14 @@ jobs:
       - run: bin/rspec --tag search
 
       - name: Archive logs
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         if: failure()
         with:
           name: test-search-logs-${{ matrix.ruby-version }}
           path: log/
 
       - name: Archive test screenshots
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         if: failure()
         with:
           name: test-search-screenshots
diff --git a/app/helpers/json_ld_helper.rb b/app/helpers/json_ld_helper.rb
index 675d8b8730..804cc72d70 100644
--- a/app/helpers/json_ld_helper.rb
+++ b/app/helpers/json_ld_helper.rb
@@ -226,6 +226,72 @@ module JsonLdHelper
     end
   end
 
+  # Iterate through the pages of an activitypub collection,
+  # returning the collected items and the number of pages that were fetched.
+  #
+  # @param collection_or_uri [String, Hash]
+  #   either the URI or an already-fetched AP object
+  # @param max_pages [Integer, nil]
+  #   Max pages to fetch, if nil, fetch until no more pages
+  # @param max_items [Integer, nil]
+  #   Max items to fetch, if nil, fetch until no more items
+  # @param reference_uri [String, nil]
+  #   If not nil, a URI to compare to the collection URI.
+  #   If the host of the collection URI does not match the reference URI,
+  #   do not fetch the collection page.
+  # @param on_behalf_of [Account, nil]
+  #   Sign the request on behalf of the Account, if not nil
+  # @return [Array<Array<Hash>, Integer>, nil]
+  #   The collection items and the number of pages fetched
+  def collection_items(collection_or_uri, max_pages: 1, max_items: nil, reference_uri: nil, on_behalf_of: nil)
+    collection = fetch_collection_page(collection_or_uri, reference_uri: reference_uri, on_behalf_of: on_behalf_of)
+    return unless collection.is_a?(Hash)
+
+    collection = fetch_collection_page(collection['first'], reference_uri: reference_uri, on_behalf_of: on_behalf_of) if collection['first'].present?
+    return unless collection.is_a?(Hash)
+
+    items = []
+    n_pages = 1
+    while collection.is_a?(Hash)
+      items.concat(as_array(collection_page_items(collection)))
+
+      break if !max_items.nil? && items.size >= max_items
+      break if !max_pages.nil? && n_pages >= max_pages
+
+      collection = collection['next'].present? ? fetch_collection_page(collection['next'], reference_uri: reference_uri, on_behalf_of: on_behalf_of) : nil
+      n_pages += 1
+    end
+
+    [items, n_pages]
+  end
+
+  def collection_page_items(collection)
+    case collection['type']
+    when 'Collection', 'CollectionPage'
+      collection['items']
+    when 'OrderedCollection', 'OrderedCollectionPage'
+      collection['orderedItems']
+    end
+  end
+
+  # Fetch a single collection page
+  # To get the whole collection, use collection_items
+  #
+  # @param collection_or_uri [String, Hash]
+  # @param reference_uri [String, nil]
+  #   If not nil, a URI to compare to the collection URI.
+  #   If the host of the collection URI does not match the reference URI,
+  #   do not fetch the collection page.
+  # @param on_behalf_of [Account, nil]
+  #   Sign the request on behalf of the Account, if not nil
+  # @return [Hash, nil]
+  def fetch_collection_page(collection_or_uri, reference_uri: nil, on_behalf_of: nil)
+    return collection_or_uri if collection_or_uri.is_a?(Hash)
+    return if !reference_uri.nil? && non_matching_uri_hosts?(reference_uri, collection_or_uri)
+
+    fetch_resource_without_id_validation(collection_or_uri, on_behalf_of, raise_on_error: :temporary)
+  end
+
   def valid_activitypub_content_type?(response)
     return true if response.mime_type == 'application/activity+json'
 
diff --git a/app/javascript/flavours/glitch/actions/interactions.js b/app/javascript/flavours/glitch/actions/interactions.js
index 92142d782c..38694d83e5 100644
--- a/app/javascript/flavours/glitch/actions/interactions.js
+++ b/app/javascript/flavours/glitch/actions/interactions.js
@@ -6,6 +6,7 @@ import { fetchRelationships } from './accounts';
 import { importFetchedAccounts, importFetchedStatus } from './importer';
 import { unreblog, reblog } from './interactions_typed';
 import { openModal } from './modal';
+import { timelineExpandPinnedFromStatus } from './timelines_typed';
 
 export const REBLOGS_EXPAND_REQUEST = 'REBLOGS_EXPAND_REQUEST';
 export const REBLOGS_EXPAND_SUCCESS = 'REBLOGS_EXPAND_SUCCESS';
@@ -368,6 +369,7 @@ export function pin(status) {
     api().post(`/api/v1/statuses/${status.get('id')}/pin`).then(response => {
       dispatch(importFetchedStatus(response.data));
       dispatch(pinSuccess(status));
+      dispatch(timelineExpandPinnedFromStatus(status));
     }).catch(error => {
       dispatch(pinFail(status, error));
     });
@@ -406,6 +408,7 @@ export function unpin (status) {
     api().post(`/api/v1/statuses/${status.get('id')}/unpin`).then(response => {
       dispatch(importFetchedStatus(response.data));
       dispatch(unpinSuccess(status));
+      dispatch(timelineExpandPinnedFromStatus(status));
     }).catch(error => {
       dispatch(unpinFail(status, error));
     });
diff --git a/app/javascript/flavours/glitch/actions/timelines.test.ts b/app/javascript/flavours/glitch/actions/timelines.test.ts
index e7f4198cde..239692dd34 100644
--- a/app/javascript/flavours/glitch/actions/timelines.test.ts
+++ b/app/javascript/flavours/glitch/actions/timelines.test.ts
@@ -57,4 +57,29 @@ describe('parseTimelineKey', () => {
       tagged: 'nature',
     });
   });
+
+  test('parses legacy account timeline key with pinned correctly', () => {
+    const params = parseTimelineKey('account:789:pinned:nature');
+    expect(params).toEqual({
+      type: 'account',
+      userId: '789',
+      replies: false,
+      boosts: false,
+      media: false,
+      pinned: true,
+      tagged: 'nature',
+    });
+  });
+
+  test('parses legacy account timeline key with media correctly', () => {
+    const params = parseTimelineKey('account:789:media');
+    expect(params).toEqual({
+      type: 'account',
+      userId: '789',
+      replies: false,
+      boosts: false,
+      media: true,
+      pinned: false,
+    });
+  });
 });
diff --git a/app/javascript/flavours/glitch/actions/timelines_typed.ts b/app/javascript/flavours/glitch/actions/timelines_typed.ts
index 8d4c7a0178..dd8f160b61 100644
--- a/app/javascript/flavours/glitch/actions/timelines_typed.ts
+++ b/app/javascript/flavours/glitch/actions/timelines_typed.ts
@@ -1,10 +1,16 @@
 import { createAction } from '@reduxjs/toolkit';
+import type { List as ImmutableList, Map as ImmutableMap } from 'immutable';
 
 import { usePendingItems as preferPendingItems } from 'flavours/glitch/initial_state';
 
+import type { Status } from '../models/status';
 import { createAppThunk } from '../store/typed_functions';
 
-import { expandTimeline, TIMELINE_NON_STATUS_MARKERS } from './timelines';
+import {
+  expandAccountFeaturedTimeline,
+  expandTimeline,
+  TIMELINE_NON_STATUS_MARKERS,
+} from './timelines';
 
 export const expandTimelineByKey = createAppThunk(
   (args: { key: string; maxId?: number }, { dispatch }) => {
@@ -119,8 +125,25 @@ export function parseTimelineKey(key: string): TimelineParams | null {
       type: 'account',
       userId,
       tagged: segments[3],
+      pinned: false,
+      boosts: false,
+      replies: false,
+      media: false,
     };
 
+    // Handle legacy keys.
+    const flagsSegment = segments[2];
+    if (!flagsSegment || !/^[01]{4}$/.test(flagsSegment)) {
+      if (flagsSegment === 'pinned') {
+        parsed.pinned = true;
+      } else if (flagsSegment === 'with_replies') {
+        parsed.replies = true;
+      } else if (flagsSegment === 'media') {
+        parsed.media = true;
+      }
+      return parsed;
+    }
+
     const view = segments[2]?.split('') ?? [];
     for (let i = 0; i < view.length; i++) {
       const flagName = ACCOUNT_FILTERS[i];
@@ -150,6 +173,11 @@ export function parseTimelineKey(key: string): TimelineParams | null {
   return null;
 }
 
+export function isTimelineKeyPinned(key: string) {
+  const parsedKey = parseTimelineKey(key);
+  return parsedKey?.type === 'account' && parsedKey.pinned;
+}
+
 export function isNonStatusId(value: unknown) {
   return TIMELINE_NON_STATUS_MARKERS.includes(value as string | null);
 }
@@ -170,3 +198,53 @@ export const timelineDelete = createAction<{
   references: string[];
   reblogOf: string | null;
 }>('timelines/delete');
+
+export const timelineExpandPinnedFromStatus = createAppThunk(
+  (status: Status, { dispatch, getState }) => {
+    const accountId = status.getIn(['account', 'id']) as string;
+    if (!accountId) {
+      return;
+    }
+
+    // Verify that any of the relevant timelines are actually expanded before dispatching, to avoid unnecessary API calls.
+    const timelines = getState().timelines as ImmutableMap<string, unknown>;
+    if (!timelines.some((_, key) => key.startsWith(`account:${accountId}:`))) {
+      return;
+    }
+
+    void dispatch(
+      expandTimelineByParams({
+        type: 'account',
+        userId: accountId,
+        pinned: true,
+      }),
+    );
+    void dispatch(expandAccountFeaturedTimeline(accountId));
+
+    // Iterate over tags and clear those too.
+    const tags = status.get('tags') as
+      | ImmutableList<ImmutableMap<'name', string>> // We only care about the tag name.
+      | undefined;
+    if (!tags) {
+      return;
+    }
+    tags.forEach((tag) => {
+      const tagName = tag.get('name');
+      if (!tagName) {
+        return;
+      }
+
+      void dispatch(
+        expandTimelineByParams({
+          type: 'account',
+          userId: accountId,
+          pinned: true,
+          tagged: tagName,
+        }),
+      );
+      void dispatch(
+        expandAccountFeaturedTimeline(accountId, { tagged: tagName }),
+      );
+    });
+  },
+);
diff --git a/app/javascript/flavours/glitch/reducers/timelines.js b/app/javascript/flavours/glitch/reducers/timelines.js
index 3a7da91651..d50df05344 100644
--- a/app/javascript/flavours/glitch/reducers/timelines.js
+++ b/app/javascript/flavours/glitch/reducers/timelines.js
@@ -1,6 +1,5 @@
 import { Map as ImmutableMap, List as ImmutableList, OrderedSet as ImmutableOrderedSet, fromJS } from 'immutable';
 
-import { timelineDelete, isNonStatusId } from 'flavours/glitch/actions/timelines_typed';
 
 import {
   blockAccountSuccess,
@@ -21,6 +20,7 @@ import {
   TIMELINE_GAP,
   disconnectTimeline,
 } from '../actions/timelines';
+import { timelineDelete, isTimelineKeyPinned, isNonStatusId } from '../actions/timelines_typed';
 import { compareId } from '../compare_id';
 
 const initialState = ImmutableMap();
@@ -50,7 +50,7 @@ const expandNormalizedTimeline = (state, timeline, statuses, next, isPartial, is
 
     if (!next && !isLoadingRecent) mMap.set('hasMore', false);
 
-    if (timeline.endsWith(':pinned')) {
+    if (isTimelineKeyPinned(timeline)) {
       mMap.set('items', statuses.map(status => status.get('id')));
     } else if (!statuses.isEmpty()) {
       usePendingItems = isLoadingRecent && (usePendingItems || !mMap.get('pendingItems').isEmpty());
diff --git a/app/javascript/mastodon/actions/interactions.js b/app/javascript/mastodon/actions/interactions.js
index d3538a8850..437f597314 100644
--- a/app/javascript/mastodon/actions/interactions.js
+++ b/app/javascript/mastodon/actions/interactions.js
@@ -6,6 +6,7 @@ import { fetchRelationships } from './accounts';
 import { importFetchedAccounts, importFetchedStatus } from './importer';
 import { unreblog, reblog } from './interactions_typed';
 import { openModal } from './modal';
+import { timelineExpandPinnedFromStatus } from './timelines_typed';
 
 export const REBLOGS_EXPAND_REQUEST = 'REBLOGS_EXPAND_REQUEST';
 export const REBLOGS_EXPAND_SUCCESS = 'REBLOGS_EXPAND_SUCCESS';
@@ -368,6 +369,7 @@ export function pin(status) {
     api().post(`/api/v1/statuses/${status.get('id')}/pin`).then(response => {
       dispatch(importFetchedStatus(response.data));
       dispatch(pinSuccess(status));
+      dispatch(timelineExpandPinnedFromStatus(status));
     }).catch(error => {
       dispatch(pinFail(status, error));
     });
@@ -406,6 +408,7 @@ export function unpin (status) {
     api().post(`/api/v1/statuses/${status.get('id')}/unpin`).then(response => {
       dispatch(importFetchedStatus(response.data));
       dispatch(unpinSuccess(status));
+      dispatch(timelineExpandPinnedFromStatus(status));
     }).catch(error => {
       dispatch(unpinFail(status, error));
     });
diff --git a/app/javascript/mastodon/actions/timelines.test.ts b/app/javascript/mastodon/actions/timelines.test.ts
index e7f4198cde..239692dd34 100644
--- a/app/javascript/mastodon/actions/timelines.test.ts
+++ b/app/javascript/mastodon/actions/timelines.test.ts
@@ -57,4 +57,29 @@ describe('parseTimelineKey', () => {
       tagged: 'nature',
     });
   });
+
+  test('parses legacy account timeline key with pinned correctly', () => {
+    const params = parseTimelineKey('account:789:pinned:nature');
+    expect(params).toEqual({
+      type: 'account',
+      userId: '789',
+      replies: false,
+      boosts: false,
+      media: false,
+      pinned: true,
+      tagged: 'nature',
+    });
+  });
+
+  test('parses legacy account timeline key with media correctly', () => {
+    const params = parseTimelineKey('account:789:media');
+    expect(params).toEqual({
+      type: 'account',
+      userId: '789',
+      replies: false,
+      boosts: false,
+      media: true,
+      pinned: false,
+    });
+  });
 });
diff --git a/app/javascript/mastodon/actions/timelines_typed.ts b/app/javascript/mastodon/actions/timelines_typed.ts
index d1fcfb1c65..f07b1274e2 100644
--- a/app/javascript/mastodon/actions/timelines_typed.ts
+++ b/app/javascript/mastodon/actions/timelines_typed.ts
@@ -1,10 +1,16 @@
 import { createAction } from '@reduxjs/toolkit';
+import type { List as ImmutableList, Map as ImmutableMap } from 'immutable';
 
 import { usePendingItems as preferPendingItems } from 'mastodon/initial_state';
 
+import type { Status } from '../models/status';
 import { createAppThunk } from '../store/typed_functions';
 
-import { expandTimeline, TIMELINE_NON_STATUS_MARKERS } from './timelines';
+import {
+  expandAccountFeaturedTimeline,
+  expandTimeline,
+  TIMELINE_NON_STATUS_MARKERS,
+} from './timelines';
 
 export const expandTimelineByKey = createAppThunk(
   (args: { key: string; maxId?: number }, { dispatch }) => {
@@ -119,8 +125,25 @@ export function parseTimelineKey(key: string): TimelineParams | null {
       type: 'account',
       userId,
       tagged: segments[3],
+      pinned: false,
+      boosts: false,
+      replies: false,
+      media: false,
     };
 
+    // Handle legacy keys.
+    const flagsSegment = segments[2];
+    if (!flagsSegment || !/^[01]{4}$/.test(flagsSegment)) {
+      if (flagsSegment === 'pinned') {
+        parsed.pinned = true;
+      } else if (flagsSegment === 'with_replies') {
+        parsed.replies = true;
+      } else if (flagsSegment === 'media') {
+        parsed.media = true;
+      }
+      return parsed;
+    }
+
     const view = segments[2]?.split('') ?? [];
     for (let i = 0; i < view.length; i++) {
       const flagName = ACCOUNT_FILTERS[i];
@@ -150,6 +173,11 @@ export function parseTimelineKey(key: string): TimelineParams | null {
   return null;
 }
 
+export function isTimelineKeyPinned(key: string) {
+  const parsedKey = parseTimelineKey(key);
+  return parsedKey?.type === 'account' && parsedKey.pinned;
+}
+
 export function isNonStatusId(value: unknown) {
   return TIMELINE_NON_STATUS_MARKERS.includes(value as string | null);
 }
@@ -170,3 +198,53 @@ export const timelineDelete = createAction<{
   references: string[];
   reblogOf: string | null;
 }>('timelines/delete');
+
+export const timelineExpandPinnedFromStatus = createAppThunk(
+  (status: Status, { dispatch, getState }) => {
+    const accountId = status.getIn(['account', 'id']) as string;
+    if (!accountId) {
+      return;
+    }
+
+    // Verify that any of the relevant timelines are actually expanded before dispatching, to avoid unnecessary API calls.
+    const timelines = getState().timelines as ImmutableMap<string, unknown>;
+    if (!timelines.some((_, key) => key.startsWith(`account:${accountId}:`))) {
+      return;
+    }
+
+    void dispatch(
+      expandTimelineByParams({
+        type: 'account',
+        userId: accountId,
+        pinned: true,
+      }),
+    );
+    void dispatch(expandAccountFeaturedTimeline(accountId));
+
+    // Iterate over tags and clear those too.
+    const tags = status.get('tags') as
+      | ImmutableList<ImmutableMap<'name', string>> // We only care about the tag name.
+      | undefined;
+    if (!tags) {
+      return;
+    }
+    tags.forEach((tag) => {
+      const tagName = tag.get('name');
+      if (!tagName) {
+        return;
+      }
+
+      void dispatch(
+        expandTimelineByParams({
+          type: 'account',
+          userId: accountId,
+          pinned: true,
+          tagged: tagName,
+        }),
+      );
+      void dispatch(
+        expandAccountFeaturedTimeline(accountId, { tagged: tagName }),
+      );
+    });
+  },
+);
diff --git a/app/javascript/mastodon/reducers/timelines.js b/app/javascript/mastodon/reducers/timelines.js
index e915fa7070..df0a26bf8d 100644
--- a/app/javascript/mastodon/reducers/timelines.js
+++ b/app/javascript/mastodon/reducers/timelines.js
@@ -1,6 +1,5 @@
 import { Map as ImmutableMap, List as ImmutableList, OrderedSet as ImmutableOrderedSet, fromJS } from 'immutable';
 
-import { timelineDelete, isNonStatusId } from 'mastodon/actions/timelines_typed';
 
 import {
   blockAccountSuccess,
@@ -21,6 +20,7 @@ import {
   TIMELINE_GAP,
   disconnectTimeline,
 } from '../actions/timelines';
+import { timelineDelete, isTimelineKeyPinned, isNonStatusId } from '../actions/timelines_typed';
 import { compareId } from '../compare_id';
 
 const initialState = ImmutableMap();
@@ -50,7 +50,7 @@ const expandNormalizedTimeline = (state, timeline, statuses, next, isPartial, is
 
     if (!next && !isLoadingRecent) mMap.set('hasMore', false);
 
-    if (timeline.endsWith(':pinned')) {
+    if (isTimelineKeyPinned(timeline)) {
       mMap.set('items', statuses.map(status => status.get('id')));
     } else if (!statuses.isEmpty()) {
       usePendingItems = isLoadingRecent && (usePendingItems || !mMap.get('pendingItems').isEmpty());
diff --git a/app/services/activitypub/fetch_featured_collection_service.rb b/app/services/activitypub/fetch_featured_collection_service.rb
index 352e1cbf5b..1ed19b35ee 100644
--- a/app/services/activitypub/fetch_featured_collection_service.rb
+++ b/app/services/activitypub/fetch_featured_collection_service.rb
@@ -8,33 +8,15 @@ class ActivityPub::FetchFeaturedCollectionService < BaseService
 
     @account = account
     @options = options
-    @json    = fetch_collection(options[:collection].presence || @account.featured_collection_url)
+    @json    = fetch_collection_page(options[:collection].presence || @account.featured_collection_url)
     return if @json.blank?
 
-    process_items(collection_items(@json))
+    @items, = collection_items(@json, max_pages: 1, reference_uri: @account.uri, on_behalf_of: local_follower)
+    process_items(@items)
   end
 
   private
 
-  def collection_items(collection)
-    collection = fetch_collection(collection['first']) if collection['first'].present?
-    return unless collection.is_a?(Hash)
-
-    case collection['type']
-    when 'Collection', 'CollectionPage'
-      as_array(collection['items'])
-    when 'OrderedCollection', 'OrderedCollectionPage'
-      as_array(collection['orderedItems'])
-    end
-  end
-
-  def fetch_collection(collection_or_uri)
-    return collection_or_uri if collection_or_uri.is_a?(Hash)
-    return if non_matching_uri_hosts?(@account.uri, collection_or_uri)
-
-    fetch_resource_without_id_validation(collection_or_uri, local_follower, raise_on_error: :temporary)
-  end
-
   def process_items(items)
     return if items.nil?
 
diff --git a/app/services/activitypub/fetch_featured_tags_collection_service.rb b/app/services/activitypub/fetch_featured_tags_collection_service.rb
index ec2422a075..92ef5c07d3 100644
--- a/app/services/activitypub/fetch_featured_tags_collection_service.rb
+++ b/app/services/activitypub/fetch_featured_tags_collection_service.rb
@@ -11,43 +11,12 @@ class ActivityPub::FetchFeaturedTagsCollectionService < BaseService
 
     return unless supported_context?(@json)
 
-    process_items(collection_items(@json))
+    @items, = collection_items(@json, max_items: FeaturedTag::LIMIT, max_pages: FeaturedTag::LIMIT, reference_uri: @account.uri, on_behalf_of: local_follower)
+    process_items(@items)
   end
 
   private
 
-  def collection_items(collection)
-    all_items = []
-
-    collection = fetch_collection(collection['first']) if collection['first'].present?
-
-    while collection.is_a?(Hash)
-      items = case collection['type']
-              when 'Collection', 'CollectionPage'
-                collection['items']
-              when 'OrderedCollection', 'OrderedCollectionPage'
-                collection['orderedItems']
-              end
-
-      break if items.blank?
-
-      all_items.concat(items)
-
-      break if all_items.size >= FeaturedTag::LIMIT
-
-      collection = collection['next'].present? ? fetch_collection(collection['next']) : nil
-    end
-
-    all_items
-  end
-
-  def fetch_collection(collection_or_uri)
-    return collection_or_uri if collection_or_uri.is_a?(Hash)
-    return if non_matching_uri_hosts?(@account.uri, collection_or_uri)
-
-    fetch_resource_without_id_validation(collection_or_uri, local_follower, raise_on_error: :temporary)
-  end
-
   def process_items(items)
     names            = items.filter_map { |item| item['type'] == 'Hashtag' && item['name']&.delete_prefix('#') }.take(FeaturedTag::LIMIT)
     tags             = names.index_by { |name| HashtagNormalizer.new.normalize(name) }
diff --git a/app/services/activitypub/fetch_replies_service.rb b/app/services/activitypub/fetch_replies_service.rb
index 327c88d846..0a6ad047ab 100644
--- a/app/services/activitypub/fetch_replies_service.rb
+++ b/app/services/activitypub/fetch_replies_service.rb
@@ -8,9 +8,13 @@ class ActivityPub::FetchRepliesService < BaseService
 
   def call(reference_uri, collection_or_uri, max_pages: 1, allow_synchronous_requests: true, batch_id: nil, request_id: nil)
     @reference_uri = reference_uri
-    @allow_synchronous_requests = allow_synchronous_requests
+    return if !allow_synchronous_requests && !collection_or_uri.is_a?(Hash)
 
-    @items, n_pages = collection_items(collection_or_uri, max_pages: max_pages)
+    # if given a prefetched collection while forbidding synchronous requests,
+    # process it and return without fetching additional pages
+    max_pages = 1 if !allow_synchronous_requests && collection_or_uri.is_a?(Hash)
+
+    @items, n_pages = collection_items(collection_or_uri, max_pages: max_pages, max_items: MAX_REPLIES, reference_uri: @reference_uri)
     return if @items.nil?
 
     @items = filter_replies(@items)
@@ -26,45 +30,6 @@ class ActivityPub::FetchRepliesService < BaseService
 
   private
 
-  def collection_items(collection_or_uri, max_pages: 1)
-    collection = fetch_collection(collection_or_uri)
-    return unless collection.is_a?(Hash)
-
-    collection = fetch_collection(collection['first']) if collection['first'].present?
-    return unless collection.is_a?(Hash)
-
-    items = []
-    n_pages = 1
-    while collection.is_a?(Hash)
-      items.concat(as_array(collection_page_items(collection)))
-
-      break if items.size >= MAX_REPLIES
-      break if n_pages >= max_pages
-
-      collection = collection['next'].present? ? fetch_collection(collection['next']) : nil
-      n_pages += 1
-    end
-
-    [items, n_pages]
-  end
-
-  def collection_page_items(collection)
-    case collection['type']
-    when 'Collection', 'CollectionPage'
-      collection['items']
-    when 'OrderedCollection', 'OrderedCollectionPage'
-      collection['orderedItems']
-    end
-  end
-
-  def fetch_collection(collection_or_uri)
-    return collection_or_uri if collection_or_uri.is_a?(Hash)
-    return unless @allow_synchronous_requests
-    return if non_matching_uri_hosts?(@reference_uri, collection_or_uri)
-
-    fetch_resource_without_id_validation(collection_or_uri, nil, raise_on_error: :temporary)
-  end
-
   def filter_replies(items)
     # Only fetch replies to the same server as the original status to avoid
     # amplification attacks.
diff --git a/app/services/activitypub/synchronize_followers_service.rb b/app/services/activitypub/synchronize_followers_service.rb
index 837796edba..9e0b452929 100644
--- a/app/services/activitypub/synchronize_followers_service.rb
+++ b/app/services/activitypub/synchronize_followers_service.rb
@@ -67,10 +67,10 @@ class ActivityPub::SynchronizeFollowersService < BaseService
 
   # Only returns true if the whole collection has been processed
   def process_collection!(collection_uri, max_pages: MAX_COLLECTION_PAGES)
-    collection = fetch_collection(collection_uri)
+    collection = fetch_collection_page(collection_uri, reference_uri: @account.uri)
     return false unless collection.is_a?(Hash)
 
-    collection = fetch_collection(collection['first']) if collection['first'].present?
+    collection = fetch_collection_page(collection['first'], reference_uri: @account.uri) if collection['first'].present?
 
     while collection.is_a?(Hash)
       process_page!(as_array(collection_page_items(collection)))
@@ -80,25 +80,9 @@ class ActivityPub::SynchronizeFollowersService < BaseService
       return true if collection['next'].blank? # We reached the end of the collection
       return false if max_pages <= 0 # We reached our pages limit
 
-      collection = fetch_collection(collection['next'])
+      collection = fetch_collection_page(collection['next'])
     end
 
     false
   end
-
-  def collection_page_items(collection)
-    case collection['type']
-    when 'Collection', 'CollectionPage'
-      collection['items']
-    when 'OrderedCollection', 'OrderedCollectionPage'
-      collection['orderedItems']
-    end
-  end
-
-  def fetch_collection(collection_or_uri)
-    return collection_or_uri if collection_or_uri.is_a?(Hash)
-    return if non_matching_uri_hosts?(@account.uri, collection_or_uri)
-
-    fetch_resource_without_id_validation(collection_or_uri, nil, raise_on_error: :temporary)
-  end
 end
diff --git a/spec/validators/existing_username_validator_spec.rb b/spec/validators/existing_username_validator_spec.rb
index ab5be52453..9620b96aee 100644
--- a/spec/validators/existing_username_validator_spec.rb
+++ b/spec/validators/existing_username_validator_spec.rb
@@ -3,82 +3,44 @@
 require 'rails_helper'
 
 RSpec.describe ExistingUsernameValidator do
+  subject { record_class.new }
+
   let(:record_class) do
     Class.new do
       include ActiveModel::Validations
 
       attr_accessor :contact, :friends
 
-      def self.name
-        'Record'
-      end
+      def self.name = 'Record'
 
       validates :contact, existing_username: true
       validates :friends, existing_username: { multiple: true }
     end
   end
-  let(:record) { record_class.new }
 
-  describe '#validate_each' do
-    context 'with a nil value' do
-      it 'does not add errors' do
-        record.contact = nil
+  context 'with a nil value' do
+    it { is_expected.to allow_value(nil).for(:contact) }
+  end
 
-        expect(record).to be_valid
-        expect(record.errors).to be_empty
+  context 'when there are no accounts' do
+    it { is_expected.to_not allow_value('user@example.com').for(:contact).with_message(I18n.t('existing_username_validator.not_found')) }
+  end
+
+  context 'when there are accounts' do
+    before { Fabricate(:account, domain: 'example.com', username: 'user') }
+
+    context 'when the value does not match' do
+      it { is_expected.to_not allow_value('friend@other.host').for(:contact).with_message(I18n.t('existing_username_validator.not_found')) }
+
+      context 'when multiple is true' do
+        it { is_expected.to_not allow_value('friend@other.host').for(:friends).with_message(I18n.t('existing_username_validator.not_found_multiple', usernames: 'friend@other.host')) }
       end
     end
 
-    context 'when there are no accounts' do
-      it 'adds errors to the record' do
-        record.contact = 'user@example.com'
+    context 'when the value does match' do
+      it { is_expected.to allow_value('user@example.com').for(:contact) }
 
-        expect(record).to_not be_valid
-        expect(record.errors.first.attribute).to eq(:contact)
-        expect(record.errors.first.type).to eq I18n.t('existing_username_validator.not_found')
-      end
-    end
-
-    context 'when there are accounts' do
-      before { Fabricate(:account, domain: 'example.com', username: 'user') }
-
-      context 'when the value does not match' do
-        it 'adds errors to the record' do
-          record.contact = 'friend@other.host'
-
-          expect(record).to_not be_valid
-          expect(record.errors.first.attribute).to eq(:contact)
-          expect(record.errors.first.type).to eq I18n.t('existing_username_validator.not_found')
-        end
-
-        context 'when multiple is true' do
-          it 'adds errors to the record' do
-            record.friends = 'friend@other.host'
-
-            expect(record).to_not be_valid
-            expect(record.errors.first.attribute).to eq(:friends)
-            expect(record.errors.first.type).to eq I18n.t('existing_username_validator.not_found_multiple', usernames: 'friend@other.host')
-          end
-        end
-      end
-
-      context 'when the value does match' do
-        it 'does not add errors to the record' do
-          record.contact = 'user@example.com'
-
-          expect(record).to be_valid
-          expect(record.errors).to be_empty
-        end
-
-        context 'when multiple is true' do
-          it 'does not add errors to the record' do
-            record.friends = 'user@example.com'
-
-            expect(record).to be_valid
-            expect(record.errors).to be_empty
-          end
-        end
-      end
+      it { is_expected.to allow_value('user@example.com').for(:friends) }
     end
   end
 end