diff --git a/README.md b/README.md
index 4aaca44..4346985 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-This project is a *fork* of [the original BirdsiteLIVE from NicolasConstant](https://github.com/NicolasConstant/BirdsiteLive). Changes made in this fork include:
+This project is a *fork* of [the original BirdsiteLIVE from NicolasConstant](https://github.com/NicolasConstant/BirdsiteLive). This fork runs in production on [a large BirdsiteLIVE instance](https://twtr.plus). Changes made in this fork include:
 
 * Rework About page entirely - also disclose unlisted accounts and federation restrictions
 * Cache Tweets so that, for example, Announces do not hit rate limits
diff --git a/src/BirdsiteLive.ActivityPub/Models/Activity.cs b/src/BirdsiteLive.ActivityPub/Models/Activity.cs
index 8c78091..9ae7d6c 100644
--- a/src/BirdsiteLive.ActivityPub/Models/Activity.cs
+++ b/src/BirdsiteLive.ActivityPub/Models/Activity.cs
@@ -1,12 +1,30 @@
-using System.Text.Json.Serialization;
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
 using Newtonsoft.Json;
 
 namespace BirdsiteLive.ActivityPub
 {
     public class Activity
     {
+        [Newtonsoft.Json.JsonIgnore]
+        public static readonly object[] DefaultContext = new object[] {
+            "https://www.w3.org/ns/activitystreams",
+            "https://w3id.org/security/v1",
+            new Dictionary<string, string>
+            {
+                { "Emoji", "toot:Emoji" },
+                { "Hashtag", "as:Hashtag" },
+                { "PropertyValue", "schema:PropertyValue" },
+                { "value", "schema:value" },
+                { "sensitive", "as:sensitive" },
+
+                { "schema", "http://schema.org#" },
+                { "toot", "https://joinmastodon.org/ns#" }
+            }
+        };
+
         [JsonProperty("@context")]
-        public object context { get; set; }
+        public object context { get; set; } = DefaultContext;
         public string id { get; set; }
         public string type { get; set; }
         public string actor { get; set; }
diff --git a/src/BirdsiteLive.ActivityPub/Models/Actor.cs b/src/BirdsiteLive.ActivityPub/Models/Actor.cs
index 8e9b6cd..12905be 100644
--- a/src/BirdsiteLive.ActivityPub/Models/Actor.cs
+++ b/src/BirdsiteLive.ActivityPub/Models/Actor.cs
@@ -12,7 +12,7 @@ namespace BirdsiteLive.ActivityPub
         //[JsonPropertyName("@context")]
         [JsonProperty("@context")]
         [JsonConverter(typeof(ContextArrayConverter))]
-        public string[] context { get; set; } = new[] { "https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1" };
+        public object[] context { get; set; } = Activity.DefaultContext;
         public string id { get; set; }
         public string type { get; set; }
         public string followers { get; set; }
diff --git a/src/BirdsiteLive.ActivityPub/Models/Followers.cs b/src/BirdsiteLive.ActivityPub/Models/Followers.cs
index 85c44d2..1a25ff6 100644
--- a/src/BirdsiteLive.ActivityPub/Models/Followers.cs
+++ b/src/BirdsiteLive.ActivityPub/Models/Followers.cs
@@ -7,7 +7,7 @@ namespace BirdsiteLive.ActivityPub.Models
     {
         [JsonProperty("@context")]
         [JsonConverter(typeof(ContextArrayConverter))]
-        public string context { get; set; } = "https://www.w3.org/ns/activitystreams";
+        public object[] context { get; set; } = Activity.DefaultContext;
 
         public string id { get; set; }
         public string type { get; set; } = "OrderedCollection";
diff --git a/src/BirdsiteLive.ActivityPub/Models/Note.cs b/src/BirdsiteLive.ActivityPub/Models/Note.cs
index fc6dc5b..2c19e9b 100644
--- a/src/BirdsiteLive.ActivityPub/Models/Note.cs
+++ b/src/BirdsiteLive.ActivityPub/Models/Note.cs
@@ -1,5 +1,6 @@
 using BirdsiteLive.ActivityPub.Converters;
 using Newtonsoft.Json;
+using System.Collections.Generic;
 
 namespace BirdsiteLive.ActivityPub.Models
 {
@@ -7,7 +8,7 @@ namespace BirdsiteLive.ActivityPub.Models
     {
         [JsonProperty("@context")]
         [JsonConverter(typeof(ContextArrayConverter))]
-        public string[] context { get; set; } = new[] { "https://www.w3.org/ns/activitystreams" };
+        public object[] context { get; set; } = Activity.DefaultContext;
 
         public string id { get; set; }
         public string type { get; } = "Note";