diff --git a/lib/shared/messages/add-members-message-spec.js b/lib/shared/messages/add-members-message-spec.js
--- a/lib/shared/messages/add-members-message-spec.js
+++ b/lib/shared/messages/add-members-message-spec.js
@@ -168,5 +168,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawAddMembersMessageInfoValidator,
 });
diff --git a/lib/shared/messages/change-role-message-spec.js b/lib/shared/messages/change-role-message-spec.js
--- a/lib/shared/messages/change-role-message-spec.js
+++ b/lib/shared/messages/change-role-message-spec.js
@@ -238,5 +238,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawChangeRoleMessageInfoValidator,
 });
diff --git a/lib/shared/messages/change-settings-message-spec.js b/lib/shared/messages/change-settings-message-spec.js
--- a/lib/shared/messages/change-settings-message-spec.js
+++ b/lib/shared/messages/change-settings-message-spec.js
@@ -184,5 +184,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawChangeSettingsMessageInfoValidator,
 });
diff --git a/lib/shared/messages/create-entry-message-spec.js b/lib/shared/messages/create-entry-message-spec.js
--- a/lib/shared/messages/create-entry-message-spec.js
+++ b/lib/shared/messages/create-entry-message-spec.js
@@ -123,5 +123,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawCreateEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/create-sidebar-message-spec.js b/lib/shared/messages/create-sidebar-message-spec.js
--- a/lib/shared/messages/create-sidebar-message-spec.js
+++ b/lib/shared/messages/create-sidebar-message-spec.js
@@ -208,5 +208,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawCreateSidebarMessageInfoValidator,
 });
diff --git a/lib/shared/messages/create-sub-thread-message-spec.js b/lib/shared/messages/create-sub-thread-message-spec.js
--- a/lib/shared/messages/create-sub-thread-message-spec.js
+++ b/lib/shared/messages/create-sub-thread-message-spec.js
@@ -165,5 +165,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawCreateSubthreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/create-thread-message-spec.js b/lib/shared/messages/create-thread-message-spec.js
--- a/lib/shared/messages/create-thread-message-spec.js
+++ b/lib/shared/messages/create-thread-message-spec.js
@@ -204,5 +204,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawCreateThreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/delete-entry-message-spec.js b/lib/shared/messages/delete-entry-message-spec.js
--- a/lib/shared/messages/delete-entry-message-spec.js
+++ b/lib/shared/messages/delete-entry-message-spec.js
@@ -138,5 +138,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawDeleteEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/edit-entry-message-spec.js b/lib/shared/messages/edit-entry-message-spec.js
--- a/lib/shared/messages/edit-entry-message-spec.js
+++ b/lib/shared/messages/edit-entry-message-spec.js
@@ -123,5 +123,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawEditEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/edit-message-spec.js b/lib/shared/messages/edit-message-spec.js
--- a/lib/shared/messages/edit-message-spec.js
+++ b/lib/shared/messages/edit-message-spec.js
@@ -142,5 +142,7 @@
 
   canBeSidebarSource: false,
 
+  canBePinned: false,
+
   validator: rawEditMessageInfoValidator,
 });
diff --git a/lib/shared/messages/join-thread-message-spec.js b/lib/shared/messages/join-thread-message-spec.js
--- a/lib/shared/messages/join-thread-message-spec.js
+++ b/lib/shared/messages/join-thread-message-spec.js
@@ -121,5 +121,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawJoinThreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/leave-thread-message-spec.js b/lib/shared/messages/leave-thread-message-spec.js
--- a/lib/shared/messages/leave-thread-message-spec.js
+++ b/lib/shared/messages/leave-thread-message-spec.js
@@ -121,5 +121,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawLeaveThreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/message-spec.js b/lib/shared/messages/message-spec.js
--- a/lib/shared/messages/message-spec.js
+++ b/lib/shared/messages/message-spec.js
@@ -114,6 +114,7 @@
   +threadIDs?: (rawMessageInfo: RawInfo) => $ReadOnlyArray<string>,
   +includedInRepliesCount?: boolean,
   +canBeSidebarSource: boolean,
+  +canBePinned: boolean,
   +useCreationSideEffectsFunc?: () => CreationSideEffectsFunc<RawInfo>,
   +validator: TType<RawInfo>,
 };
diff --git a/lib/shared/messages/multimedia-message-spec.js b/lib/shared/messages/multimedia-message-spec.js
--- a/lib/shared/messages/multimedia-message-spec.js
+++ b/lib/shared/messages/multimedia-message-spec.js
@@ -353,6 +353,8 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: true,
+
   validator: rawMultimediaMessageInfoValidator,
 });
 
diff --git a/lib/shared/messages/reaction-message-spec.js b/lib/shared/messages/reaction-message-spec.js
--- a/lib/shared/messages/reaction-message-spec.js
+++ b/lib/shared/messages/reaction-message-spec.js
@@ -220,5 +220,7 @@
 
   canBeSidebarSource: false,
 
+  canBePinned: false,
+
   validator: rawReactionMessageInfoValidator,
 });
diff --git a/lib/shared/messages/remove-members-message-spec.js b/lib/shared/messages/remove-members-message-spec.js
--- a/lib/shared/messages/remove-members-message-spec.js
+++ b/lib/shared/messages/remove-members-message-spec.js
@@ -168,5 +168,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawRemoveMembersMessageInfoValidator,
 });
diff --git a/lib/shared/messages/restore-entry-message-spec.js b/lib/shared/messages/restore-entry-message-spec.js
--- a/lib/shared/messages/restore-entry-message-spec.js
+++ b/lib/shared/messages/restore-entry-message-spec.js
@@ -138,5 +138,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawRestoreEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/sidebar-source-message-spec.js b/lib/shared/messages/sidebar-source-message-spec.js
--- a/lib/shared/messages/sidebar-source-message-spec.js
+++ b/lib/shared/messages/sidebar-source-message-spec.js
@@ -174,5 +174,7 @@
 
   canBeSidebarSource: false,
 
+  canBePinned: false,
+
   validator: rawSidebarSourceMessageInfoValidator,
 });
diff --git a/lib/shared/messages/text-message-spec.js b/lib/shared/messages/text-message-spec.js
--- a/lib/shared/messages/text-message-spec.js
+++ b/lib/shared/messages/text-message-spec.js
@@ -319,5 +319,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: true,
+
   validator: rawTextMessageInfoValidator,
 });
diff --git a/lib/shared/messages/toggle-pin-message-spec.js b/lib/shared/messages/toggle-pin-message-spec.js
--- a/lib/shared/messages/toggle-pin-message-spec.js
+++ b/lib/shared/messages/toggle-pin-message-spec.js
@@ -157,5 +157,7 @@
 
   canBeSidebarSource: false,
 
+  canBePinned: false,
+
   validator: rawTogglePinMessageInfoValidator,
 });
diff --git a/lib/shared/messages/unsupported-message-spec.js b/lib/shared/messages/unsupported-message-spec.js
--- a/lib/shared/messages/unsupported-message-spec.js
+++ b/lib/shared/messages/unsupported-message-spec.js
@@ -76,5 +76,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawUnsupportedMessageInfoValidator,
 });
diff --git a/lib/shared/messages/update-relationship-message-spec.js b/lib/shared/messages/update-relationship-message-spec.js
--- a/lib/shared/messages/update-relationship-message-spec.js
+++ b/lib/shared/messages/update-relationship-message-spec.js
@@ -156,5 +156,7 @@
 
   canBeSidebarSource: true,
 
+  canBePinned: false,
+
   validator: rawUpdateRelationshipMessageInfoValidator,
 });