diff --git a/DysonNetwork.Sphere/Activity/ActivityService.cs b/DysonNetwork.Sphere/Activity/ActivityService.cs
index e9406d6..4c9e813 100644
--- a/DysonNetwork.Sphere/Activity/ActivityService.cs
+++ b/DysonNetwork.Sphere/Activity/ActivityService.cs
@@ -1,4 +1,3 @@
-
 using DysonNetwork.Sphere.Account;
 using DysonNetwork.Sphere.Discovery;
 using DysonNetwork.Sphere.Post;
@@ -12,9 +11,14 @@ using System.Threading.Tasks;
 
 namespace DysonNetwork.Sphere.Activity;
 
-public class ActivityService(AppDatabase db, PublisherService pub, RelationshipService rels, PostService ps, DiscoveryService ds)
+public class ActivityService(
+    AppDatabase db,
+    PublisherService pub,
+    RelationshipService rels,
+    PostService ps,
+    DiscoveryService ds)
 {
-    private double CalculateHotRank(Post.Post post, Instant now)
+    private static double CalculateHotRank(Post.Post post, Instant now)
     {
         var score = post.Upvotes - post.Downvotes;
         var postTime = post.PublishedAt ?? post.CreatedAt;
@@ -32,7 +36,9 @@ public class ActivityService(AppDatabase db, PublisherService pub, RelationshipS
             var realms = await ds.GetPublicRealmsAsync(null, null, 5, 0, true);
             if (realms.Count > 0)
             {
-                activities.Add(new DiscoveryActivity("Explore Realms", realms.Cast<object>().ToList()).ToActivity());
+                activities.Add(new DiscoveryActivity(
+                    realms.Select(x => new DiscoveryItem("realm", x)).ToList()
+                ).ToActivity());
             }
         }
 
@@ -92,7 +98,9 @@ public class ActivityService(AppDatabase db, PublisherService pub, RelationshipS
             var realms = await ds.GetPublicRealmsAsync(null, null, 5, 0, true);
             if (realms.Count > 0)
             {
-                activities.Add(new DiscoveryActivity("Explore Realms", realms.Cast<object>().ToList()).ToActivity());
+                activities.Add(new DiscoveryActivity(
+                    realms.Select(x => new DiscoveryItem("realm", x)).ToList()
+                ).ToActivity());
             }
         }
 
@@ -158,4 +166,4 @@ public class ActivityService(AppDatabase db, PublisherService pub, RelationshipS
 
         return activities;
     }
-}
+}
\ No newline at end of file
diff --git a/DysonNetwork.Sphere/Activity/DiscoveryActivity.cs b/DysonNetwork.Sphere/Activity/DiscoveryActivity.cs
index 4dd3119..6111589 100644
--- a/DysonNetwork.Sphere/Activity/DiscoveryActivity.cs
+++ b/DysonNetwork.Sphere/Activity/DiscoveryActivity.cs
@@ -2,31 +2,25 @@ using System;
 using System.Collections.Generic;
 using NodaTime;
 
-namespace DysonNetwork.Sphere.Activity
+namespace DysonNetwork.Sphere.Activity;
+
+public class DiscoveryActivity(List<DiscoveryItem> items) : IActivity
 {
-    public class DiscoveryActivity : IActivity
+    public List<DiscoveryItem> Items { get; set; } = items;
+
+    public Activity ToActivity()
     {
-        public string Title { get; set; }
-        public List<object> Items { get; set; }
-
-        public DiscoveryActivity(string title, List<object> items)
+        var now = SystemClock.Instance.GetCurrentInstant();
+        return new Activity
         {
-            Title = title;
-            Items = items;
-        }
-
-        public Activity ToActivity()
-        {
-            var now = SystemClock.Instance.GetCurrentInstant();
-            return new Activity
-            {
-                Id = Guid.NewGuid(),
-                Type = "discovery",
-                ResourceIdentifier = "discovery",
-                Data = this,
-                CreatedAt = now,
-                UpdatedAt = now,
-            };
-        }
+            Id = Guid.NewGuid(),
+            Type = "discovery",
+            ResourceIdentifier = "discovery",
+            Data = this,
+            CreatedAt = now,
+            UpdatedAt = now,
+        };
     }
 }
+
+public record DiscoveryItem(string Type, object Data);
\ No newline at end of file