diff --git a/lib/shared/threads/protocols/dm-thread-protocol.js b/lib/shared/threads/protocols/dm-thread-protocol.js
--- a/lib/shared/threads/protocols/dm-thread-protocol.js
+++ b/lib/shared/threads/protocols/dm-thread-protocol.js
@@ -953,6 +953,7 @@
     canReactToRobotext: true,
     supportsThreadRefreshing: false,
     supportsMessageEdit: true,
+    supportsRelationships: true,
   });
 
 function pendingThreadType(numberOfOtherMembers: number) {
diff --git a/lib/shared/threads/protocols/farcaster-thread-protocol.js b/lib/shared/threads/protocols/farcaster-thread-protocol.js
--- a/lib/shared/threads/protocols/farcaster-thread-protocol.js
+++ b/lib/shared/threads/protocols/farcaster-thread-protocol.js
@@ -1000,6 +1000,7 @@
     pinningMessages: true,
   },
   supportsMessageEdit: false,
+  supportsRelationships: false,
 };
 
 function pendingThreadType(numberOfOtherMembers: number) {
diff --git a/lib/shared/threads/protocols/keyserver-thread-protocol.js b/lib/shared/threads/protocols/keyserver-thread-protocol.js
--- a/lib/shared/threads/protocols/keyserver-thread-protocol.js
+++ b/lib/shared/threads/protocols/keyserver-thread-protocol.js
@@ -756,6 +756,7 @@
     canReactToRobotext: true,
     supportsThreadRefreshing: false,
     supportsMessageEdit: true,
+    supportsRelationships: true,
   });
 
 function pendingThreadType(numberOfOtherMembers: number) {
diff --git a/lib/shared/threads/thread-spec.js b/lib/shared/threads/thread-spec.js
--- a/lib/shared/threads/thread-spec.js
+++ b/lib/shared/threads/thread-spec.js
@@ -552,6 +552,7 @@
     +pinningMessages?: boolean,
   },
   +supportsMessageEdit: boolean,
+  +supportsRelationships: boolean,
 };
 
 export type ThreadSpec<
diff --git a/native/chat/message-list-container.react.js b/native/chat/message-list-container.react.js
--- a/native/chat/message-list-container.react.js
+++ b/native/chat/message-list-container.react.js
@@ -448,7 +448,10 @@
     );
 
     let relationshipPrompt = null;
-    if (threadTypeIsPersonal(threadInfo.type)) {
+    if (
+      threadTypeIsPersonal(threadInfo.type) &&
+      threadSpecs[threadInfo.type].protocol().supportsRelationships
+    ) {
       relationshipPrompt = (
         <RelationshipPrompt
           pendingPersonalThreadUserInfo={
diff --git a/native/chat/settings/thread-settings.react.js b/native/chat/settings/thread-settings.react.js
--- a/native/chat/settings/thread-settings.react.js
+++ b/native/chat/settings/thread-settings.react.js
@@ -800,7 +800,12 @@
           });
         }
 
-        if (threadInfo && threadTypeIsPersonal(threadInfo.type) && viewerID) {
+        if (
+          threadInfo &&
+          threadTypeIsPersonal(threadInfo.type) &&
+          viewerID &&
+          threadSpecs[threadInfo.type].protocol().supportsRelationships
+        ) {
           const otherMemberID = getSingleOtherUser(threadInfo, viewerID);
           if (otherMemberID) {
             const otherUserInfo = userInfos[otherMemberID];
diff --git a/native/user-profile/user-profile.react.js b/native/user-profile/user-profile.react.js
--- a/native/user-profile/user-profile.react.js
+++ b/native/user-profile/user-profile.react.js
@@ -7,6 +7,7 @@
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 import { useResolvableNames } from 'lib/hooks/names-cache.js';
+import { isFarcasterUserID } from 'lib/shared/id-utils.js';
 import { relationshipBlockedInEitherDirection } from 'lib/shared/relationship-utils.js';
 import { useUserProfileThreadInfo } from 'lib/shared/thread-utils.js';
 import {
@@ -184,7 +185,9 @@
   const relationshipButton = React.useMemo(() => {
     if (
       !userProfileThreadInfo ||
-      relationshipBlockedInEitherDirection(userInfo?.relationshipStatus)
+      relationshipBlockedInEitherDirection(userInfo?.relationshipStatus) ||
+      !userInfo?.id ||
+      isFarcasterUserID(userInfo.id)
     ) {
       return null;
     }
@@ -199,7 +202,7 @@
         }
       />
     );
-  }, [userInfo?.relationshipStatus, userProfileThreadInfo]);
+  }, [userInfo?.relationshipStatus, userProfileThreadInfo, userInfo?.id]);
 
   return (
     <View style={styles.container}>
diff --git a/web/chat/chat-message-list.react.js b/web/chat/chat-message-list.react.js
--- a/web/chat/chat-message-list.react.js
+++ b/web/chat/chat-message-list.react.js
@@ -17,7 +17,10 @@
   threadIsPending,
   threadOtherMembers,
 } from 'lib/shared/thread-utils.js';
-import { threadTypeIsPersonal } from 'lib/shared/threads/thread-specs.js';
+import {
+  threadSpecs,
+  threadTypeIsPersonal,
+} from 'lib/shared/threads/thread-specs.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 
 import { defaultMaxTextAreaHeight, editBoxHeight } from './chat-constants.js';
@@ -293,7 +296,10 @@
     const messages = messageListData.map(this.renderItem);
 
     let relationshipPrompt = null;
-    if (threadTypeIsPersonal(threadInfo.type)) {
+    if (
+      threadTypeIsPersonal(threadInfo.type) &&
+      threadSpecs[threadInfo.type].protocol().supportsRelationships
+    ) {
       const otherMembers = threadOtherMembers(
         threadInfo.members,
         this.props.viewerID,
diff --git a/web/modals/threads/settings/thread-settings-modal.react.js b/web/modals/threads/settings/thread-settings-modal.react.js
--- a/web/modals/threads/settings/thread-settings-modal.react.js
+++ b/web/modals/threads/settings/thread-settings-modal.react.js
@@ -16,7 +16,10 @@
   threadUIName,
   useThreadHasPermission,
 } from 'lib/shared/thread-utils.js';
-import { threadTypeIsPersonal } from 'lib/shared/threads/thread-specs.js';
+import {
+  threadSpecs,
+  threadTypeIsPersonal,
+} from 'lib/shared/threads/thread-specs.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type { RelationshipButton } from 'lib/types/relationship-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
@@ -95,7 +98,8 @@
       if (
         !otherUserInfo ||
         !threadInfo?.type ||
-        !threadTypeIsPersonal(threadInfo.type)
+        !threadTypeIsPersonal(threadInfo.type) ||
+        !threadSpecs[threadInfo.type].protocol().supportsRelationships
       ) {
         return ([]: RelationshipButton[]);
       }
diff --git a/web/modals/user-profile/user-profile-action-buttons.react.js b/web/modals/user-profile/user-profile-action-buttons.react.js
--- a/web/modals/user-profile/user-profile-action-buttons.react.js
+++ b/web/modals/user-profile/user-profile-action-buttons.react.js
@@ -4,6 +4,7 @@
 import * as React from 'react';
 
 import { useRelationshipPrompt } from 'lib/hooks/relationship-prompt.js';
+import { isFarcasterUserID } from 'lib/shared/id-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { userRelationshipStatus } from 'lib/types/relationship-types.js';
 
@@ -28,7 +29,8 @@
   const userProfileActionButtons = React.useMemo(() => {
     if (
       !otherUserInfo ||
-      otherUserInfo.relationshipStatus === userRelationshipStatus.FRIEND
+      otherUserInfo.relationshipStatus === userRelationshipStatus.FRIEND ||
+      isFarcasterUserID(otherUserInfo.id)
     ) {
       return <UserProfileMessageButton threadInfo={threadInfo} />;
     }