diff --git a/Iceshrimp.Backend/Core/Services/UserProfileMentionsResolver.cs b/Iceshrimp.Backend/Core/Services/UserProfileMentionsResolver.cs
index a09fdb70..5c2d5fab 100644
--- a/Iceshrimp.Backend/Core/Services/UserProfileMentionsResolver.cs
+++ b/Iceshrimp.Backend/Core/Services/UserProfileMentionsResolver.cs
@@ -10,9 +10,12 @@ using Microsoft.Extensions.Options;
 
 namespace Iceshrimp.Backend.Core.Services;
 
+using MentionTuple = (List<Note.MentionedUser> mentions,
+	Dictionary<(string usernameLower, string webDomain), string> splitDomainMapping);
+
 public class UserProfileMentionsResolver(ActivityPub.UserResolver userResolver, IOptions<Config.InstanceSection> config)
 {
-	public async Task<List<Note.MentionedUser>> ResolveMentions(ASActor actor, string? host)
+	public async Task<MentionTuple> ResolveMentions(ASActor actor, string? host)
 	{
 		var fields = actor.Attachments?.OfType<ASField>()
 		                  .Where(p => p is { Name: not null, Value: not null })
@@ -44,17 +47,25 @@ public class UserProfileMentionsResolver(ActivityPub.UserResolver userResolver,
 		                     .Select(async p => await userResolver.ResolveAsyncOrNull(p))
 		                     .AwaitAllNoConcurrencyAsync());
 
-		return users.Where(p => p != null)
-		            .Cast<User>()
-		            .DistinctBy(p => p.Id)
-		            .Select(p => new Note.MentionedUser
-		            {
-			            Host     = p.Host,
-			            Uri      = p.Uri ?? p.GetPublicUri(config.Value),
-			            Url      = p.UserProfile?.Url,
-			            Username = p.Username
-		            })
-		            .ToList();
+		var mentions = users.Where(p => p != null)
+		                    .Cast<User>()
+		                    .DistinctBy(p => p.Id)
+		                    .Select(p => new Note.MentionedUser
+		                    {
+			                    Host     = p.Host,
+			                    Uri      = p.Uri ?? p.GetPublicUri(config.Value),
+			                    Url      = p.UserProfile?.Url,
+			                    Username = p.Username
+		                    })
+		                    .ToList();
+
+		var splitDomainMapping = users.Where(p => p is { Host: not null, Uri: not null })
+		                              .Cast<User>()
+		                              .Where(p => new Uri(p.Uri!).Host != p.Host)
+		                              .DistinctBy(p => p.Host)
+		                              .ToDictionary(p => (p.UsernameLower, new Uri(p.Uri!).Host), p => p.Host!);
+
+		return (mentions, splitDomainMapping);
 	}
 
 	public async Task<List<Note.MentionedUser>> ResolveMentions(UserProfile.Field[]? fields, string? bio, string? host)
diff --git a/Iceshrimp.Backend/Core/Services/UserService.cs b/Iceshrimp.Backend/Core/Services/UserService.cs
index 958d7937..f0546770 100644
--- a/Iceshrimp.Backend/Core/Services/UserService.cs
+++ b/Iceshrimp.Backend/Core/Services/UserService.cs
@@ -28,7 +28,8 @@ public class UserService(
 	DriveService driveSvc,
 	FollowupTaskService followupTaskSvc,
 	NotificationService notificationSvc,
-	EmojiService emojiSvc
+	EmojiService emojiSvc,
+	ActivityPub.MentionsResolver mentionsResolver
 )
 {
 	private static readonly AsyncKeyedLocker<string> KeyedLocker = new(o =>
@@ -642,7 +643,7 @@ public class UserService(
 
 				if (actor != null)
 				{
-					var mentions = await bgMentionsResolver.ResolveMentions(actor, bgUser.Host);
+					var (mentions, splitDomainMapping) = await bgMentionsResolver.ResolveMentions(actor, bgUser.Host);
 					var fields = actor.Attachments != null
 						? await actor.Attachments
 						             .OfType<ASField>()
@@ -655,11 +656,13 @@ public class UserService(
 						             .AwaitAllAsync()
 						: null;
 
-					bgUser.UserProfile.Mentions = mentions;
-					bgUser.UserProfile.Fields   = fields?.ToArray() ?? [];
-					bgUser.UserProfile.Description = actor.MkSummary ??
-					                                 await MfmConverter.FromHtmlAsync(actor.Summary,
-						                                 bgUser.UserProfile.Mentions);
+					var description = actor.MkSummary != null
+						? mentionsResolver.ResolveMentions(actor.MkSummary, bgUser.Host, mentions, splitDomainMapping)
+						: await MfmConverter.FromHtmlAsync(actor.Summary, mentions);
+
+					bgUser.UserProfile.Mentions    = mentions;
+					bgUser.UserProfile.Fields      = fields?.ToArray() ?? [];
+					bgUser.UserProfile.Description = description;
 				}
 				else
 				{