diff --git a/lib/pleroma/formatter.ex b/lib/pleroma/formatter.ex
index 607843a5b..23a5ac8fe 100644
--- a/lib/pleroma/formatter.ex
+++ b/lib/pleroma/formatter.ex
@@ -36,9 +36,9 @@ defmodule Pleroma.Formatter do
         nickname_text = get_nickname_text(nickname, opts)
 
         link =
-          "<span class='h-card'><a data-user='#{id}' class='u-url mention' href='#{ap_id}'>@<span>#{
+          ~s(<span class="h-card"><a data-user="#{id}" class="u-url mention" href="#{ap_id}" rel="ugc">@<span>#{
             nickname_text
-          }</span></a></span>"
+          }</span></a></span>)
 
         {link, %{acc | mentions: MapSet.put(acc.mentions, {"@" <> nickname, user})}}
 
@@ -50,7 +50,7 @@ defmodule Pleroma.Formatter do
   def hashtag_handler("#" <> tag = tag_text, _buffer, _opts, acc) do
     tag = String.downcase(tag)
     url = "#{Pleroma.Web.base_url()}/tag/#{tag}"
-    link = "<a class='hashtag' data-tag='#{tag}' href='#{url}' rel='tag'>#{tag_text}</a>"
+    link = ~s(<a class="hashtag" data-tag="#{tag}" href="#{url}" rel="tag ugc">#{tag_text}</a>)
 
     {link, %{acc | tags: MapSet.put(acc.tags, {tag_text, tag})}}
   end
diff --git a/test/formatter_test.exs b/test/formatter_test.exs
index 3674577d6..2e4280fc2 100644
--- a/test/formatter_test.exs
+++ b/test/formatter_test.exs
@@ -19,7 +19,7 @@ defmodule Pleroma.FormatterTest do
       text = "I love #cofe and #2hu"
 
       expected_text =
-        "I love <a class='hashtag' data-tag='cofe' href='http://localhost:4001/tag/cofe' rel='tag'>#cofe</a> and <a class='hashtag' data-tag='2hu' href='http://localhost:4001/tag/2hu' rel='tag'>#2hu</a>"
+        ~s(I love <a class="hashtag" data-tag="cofe" href="http://localhost:4001/tag/cofe" rel="tag ugc">#cofe</a> and <a class="hashtag" data-tag="2hu" href="http://localhost:4001/tag/2hu" rel="tag ugc">#2hu</a>)
 
       assert {^expected_text, [], _tags} = Formatter.linkify(text)
     end
@@ -28,7 +28,7 @@ defmodule Pleroma.FormatterTest do
       text = "#fact_3: pleroma does what mastodon't"
 
       expected_text =
-        "<a class='hashtag' data-tag='fact_3' href='http://localhost:4001/tag/fact_3' rel='tag'>#fact_3</a>: pleroma does what mastodon't"
+        ~s(<a class="hashtag" data-tag="fact_3" href="http://localhost:4001/tag/fact_3" rel="tag ugc">#fact_3</a>: pleroma does what mastodon't)
 
       assert {^expected_text, [], _tags} = Formatter.linkify(text)
     end
@@ -137,13 +137,13 @@ defmodule Pleroma.FormatterTest do
       assert length(mentions) == 3
 
       expected_text =
-        "<span class='h-card'><a data-user='#{gsimg.id}' class='u-url mention' href='#{
+        ~s(<span class="h-card"><a data-user="#{gsimg.id}" class="u-url mention" href="#{
           gsimg.ap_id
-        }'>@<span>gsimg</span></a></span> According to <span class='h-card'><a data-user='#{
+        }" rel="ugc">@<span>gsimg</span></a></span> According to <span class="h-card"><a data-user="#{
           archaeme.id
-        }' class='u-url mention' href='#{"https://archeme/@archa_eme_"}'>@<span>archa_eme_</span></a></span>, that is @daggsy. Also hello <span class='h-card'><a data-user='#{
+        }" class="u-url mention" href="#{"https://archeme/@archa_eme_"}" rel="ugc">@<span>archa_eme_</span></a></span>, that is @daggsy. Also hello <span class="h-card"><a data-user="#{
           archaeme_remote.id
-        }' class='u-url mention' href='#{archaeme_remote.ap_id}'>@<span>archaeme</span></a></span>"
+        }" class="u-url mention" href="#{archaeme_remote.ap_id}" rel="ugc">@<span>archaeme</span></a></span>)
 
       assert expected_text == text
     end
@@ -158,7 +158,9 @@ defmodule Pleroma.FormatterTest do
       assert length(mentions) == 1
 
       expected_text =
-        "<span class='h-card'><a data-user='#{mike.id}' class='u-url mention' href='#{mike.ap_id}'>@<span>mike</span></a></span> test"
+        ~s(<span class="h-card"><a data-user="#{mike.id}" class="u-url mention" href="#{
+          mike.ap_id
+        }" rel="ugc">@<span>mike</span></a></span> test)
 
       assert expected_text == text
     end
@@ -172,7 +174,7 @@ defmodule Pleroma.FormatterTest do
       assert length(mentions) == 1
 
       expected_text =
-        "<span class='h-card'><a data-user='#{o.id}' class='u-url mention' href='#{o.ap_id}'>@<span>o</span></a></span> hi"
+        ~s(<span class="h-card"><a data-user="#{o.id}" class="u-url mention" href="#{o.ap_id}" rel="ugc">@<span>o</span></a></span> hi)
 
       assert expected_text == text
     end
@@ -194,13 +196,17 @@ defmodule Pleroma.FormatterTest do
       assert mentions == [{"@#{user.nickname}", user}, {"@#{other_user.nickname}", other_user}]
 
       assert expected_text ==
-               "<span class='h-card'><a data-user='#{user.id}' class='u-url mention' href='#{
+               ~s(<span class="h-card"><a data-user="#{user.id}" class="u-url mention" href="#{
                  user.ap_id
-               }'>@<span>#{user.nickname}</span></a></span> <span class='h-card'><a data-user='#{
+               }" rel="ugc">@<span>#{user.nickname}</span></a></span> <span class="h-card"><a data-user="#{
                  other_user.id
-               }' class='u-url mention' href='#{other_user.ap_id}'>@<span>#{other_user.nickname}</span></a></span> hey dudes i hate <span class='h-card'><a data-user='#{
+               }" class="u-url mention" href="#{other_user.ap_id}" rel="ugc">@<span>#{
+                 other_user.nickname
+               }</span></a></span> hey dudes i hate <span class="h-card"><a data-user="#{
                  third_user.id
-               }' class='u-url mention' href='#{third_user.ap_id}'>@<span>#{third_user.nickname}</span></a></span>"
+               }" class="u-url mention" href="#{third_user.ap_id}" rel="ugc">@<span>#{
+                 third_user.nickname
+               }</span></a></span>)
     end
 
     test "given the 'safe_mention' option, it will still work without any mention" do
diff --git a/test/user_test.exs b/test/user_test.exs
index 39ba69668..6852fcd40 100644
--- a/test/user_test.exs
+++ b/test/user_test.exs
@@ -1294,9 +1294,9 @@ defmodule Pleroma.UserTest do
       bio = "A.k.a. @nick@domain.com"
 
       expected_text =
-        "A.k.a. <span class='h-card'><a data-user='#{remote_user.id}' class='u-url mention' href='#{
+        ~s(A.k.a. <span class="h-card"><a data-user="#{remote_user.id}" class="u-url mention" href="#{
           remote_user.ap_id
-        }'>@<span>nick@domain.com</span></a></span>"
+        }" rel="ugc">@<span>nick@domain.com</span></a></span>)
 
       assert expected_text == User.parse_bio(bio, user)
     end
diff --git a/test/web/common_api/common_api_utils_test.exs b/test/web/common_api/common_api_utils_test.exs
index 78cfe3c5f..2588898d0 100644
--- a/test/web/common_api/common_api_utils_test.exs
+++ b/test/web/common_api/common_api_utils_test.exs
@@ -159,9 +159,9 @@ defmodule Pleroma.Web.CommonAPI.UtilsTest do
       expected =
         ~s(<p><strong>hello world</strong></p>\n<p><em>another <span class="h-card"><a data-user="#{
           user.id
-        }" class="u-url mention" href="http://foo.com/user__test">@<span>user__test</span></a></span> and <span class="h-card"><a data-user="#{
+        }" class="u-url mention" href="http://foo.com/user__test" rel="ugc">@<span>user__test</span></a></span> and <span class="h-card"><a data-user="#{
           user.id
-        }" class="u-url mention" href="http://foo.com/user__test">@<span>user__test</span></a></span> <a href="http://google.com" rel="ugc">google.com</a> paragraph</em></p>\n)
+        }" class="u-url mention" href="http://foo.com/user__test" rel="ugc">@<span>user__test</span></a></span> <a href="http://google.com" rel="ugc">google.com</a> paragraph</em></p>\n)
 
       {output, _, _} = Utils.format_input(text, "text/markdown")
 
diff --git a/test/web/mastodon_api/controllers/mastodon_api_controller/update_credentials_test.exs b/test/web/mastodon_api/controllers/mastodon_api_controller/update_credentials_test.exs
index 1e8d0d03b..560f55137 100644
--- a/test/web/mastodon_api/controllers/mastodon_api_controller/update_credentials_test.exs
+++ b/test/web/mastodon_api/controllers/mastodon_api_controller/update_credentials_test.exs
@@ -86,10 +86,9 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController.UpdateCredentialsTest do
       assert user = json_response(conn, 200)
 
       assert user["note"] ==
-               ~s(I drink <a class="hashtag" data-tag="cofe" href="http://localhost:4001/tag/cofe" rel="tag">#cofe</a> with <span class="h-card"><a data-user=") <>
-                 user2.id <>
-                 ~s(" class="u-url mention" href=") <>
-                 user2.ap_id <> ~s(">@<span>) <> user2.nickname <> ~s(</span></a></span>)
+               ~s(I drink <a class="hashtag" data-tag="cofe" href="http://localhost:4001/tag/cofe">#cofe</a> with <span class="h-card"><a data-user="#{
+                 user2.id
+               }" class="u-url mention" href="#{user2.ap_id}" rel="ugc">@<span>#{user2.nickname}</span></a></span>)
     end
 
     test "updates the user's locking status", %{conn: conn} do
diff --git a/test/web/mastodon_api/mastodon_api_controller_test.exs b/test/web/mastodon_api/mastodon_api_controller_test.exs
index fb04748bb..b85f3e758 100644
--- a/test/web/mastodon_api/mastodon_api_controller_test.exs
+++ b/test/web/mastodon_api/mastodon_api_controller_test.exs
@@ -996,9 +996,9 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIControllerTest do
         |> get("/api/v1/notifications")
 
       expected_response =
-        "hi <span class=\"h-card\"><a data-user=\"#{user.id}\" class=\"u-url mention\" href=\"#{
+        ~s(hi <span class="h-card"><a data-user="#{user.id}" class="u-url mention" href="#{
           user.ap_id
-        }\">@<span>#{user.nickname}</span></a></span>"
+        }" rel="ugc">@<span>#{user.nickname}</span></a></span>)
 
       assert [%{"status" => %{"content" => response}} | _rest] = json_response(conn, 200)
       assert response == expected_response
@@ -1018,9 +1018,9 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIControllerTest do
         |> get("/api/v1/notifications/#{notification.id}")
 
       expected_response =
-        "hi <span class=\"h-card\"><a data-user=\"#{user.id}\" class=\"u-url mention\" href=\"#{
+        ~s(hi <span class="h-card"><a data-user="#{user.id}" class="u-url mention" href="#{
           user.ap_id
-        }\">@<span>#{user.nickname}</span></a></span>"
+        }" rel="ugc">@<span>#{user.nickname}</span></a></span>)
 
       assert %{"status" => %{"content" => response}} = json_response(conn, 200)
       assert response == expected_response
diff --git a/test/web/twitter_api/twitter_api_test.exs b/test/web/twitter_api/twitter_api_test.exs
index 08f264431..bf1e233f5 100644
--- a/test/web/twitter_api/twitter_api_test.exs
+++ b/test/web/twitter_api/twitter_api_test.exs
@@ -109,7 +109,9 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPITest do
     {:ok, user2} = TwitterAPI.register_user(data2)
 
     expected_text =
-      "<span class='h-card'><a data-user='#{user1.id}' class='u-url mention' href='#{user1.ap_id}'>@<span>john</span></a></span> test"
+      ~s(<span class="h-card"><a data-user="#{user1.id}" class="u-url mention" href="#{
+        user1.ap_id
+      }" rel="ugc">@<span>john</span></a></span> test)
 
     assert user2.bio == expected_text
   end