diff --git a/lib/components/farcaster-data-handler.react.js b/lib/components/farcaster-data-handler.react.js
index e304aa042..1d786e63e 100644
--- a/lib/components/farcaster-data-handler.react.js
+++ b/lib/components/farcaster-data-handler.react.js
@@ -1,189 +1,207 @@
 // @flow
 
 import * as React from 'react';
 
 import { setAuxUserFIDsActionType } from '../actions/aux-user-actions.js';
 import {
   updateRelationships as serverUpdateRelationships,
   updateRelationshipsActionTypes,
 } from '../actions/relationship-actions.js';
 import { setSyncedMetadataEntryActionType } from '../actions/synced-metadata-actions.js';
 import { NeynarClientContext } from '../components/neynar-client-provider.react.js';
 import { useLegacyAshoatKeyserverCall } from '../keyserver-conn/legacy-keyserver-call.js';
 import { isLoggedInToIdentityAndAuthoritativeKeyserver } from '../selectors/user-selectors.js';
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import { relationshipActions } from '../types/relationship-types.js';
 import { syncedMetadataNames } from '../types/synced-metadata-types.js';
-import { useCurrentUserFID } from '../utils/farcaster-utils.js';
+import { useCurrentUserFID, useUnlinkFID } from '../utils/farcaster-utils.js';
 import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
 import { useSelector, useDispatch } from '../utils/redux-utils.js';
 import { usingCommServicesAccessToken } from '../utils/services-utils.js';
 
 function FarcasterDataHandler(): React.Node {
   const isActive = useSelector(state => state.lifecycleState !== 'background');
 
   const currentUserID = useSelector(state => state.currentUserInfo?.id);
 
   const loggedIn = useSelector(isLoggedInToIdentityAndAuthoritativeKeyserver);
 
   const neynarClient = React.useContext(NeynarClientContext)?.client;
 
   const identityServiceClient = React.useContext(IdentityClientContext);
   const getFarcasterUsers =
     identityServiceClient?.identityClient.getFarcasterUsers;
   const findUserIdentities =
     identityServiceClient?.identityClient.findUserIdentities;
 
   const dispatch = useDispatch();
   const dispatchActionPromise = useDispatchActionPromise();
   const updateRelationships = useLegacyAshoatKeyserverCall(
     serverUpdateRelationships,
   );
   const createThreadsAndRobotextForFarcasterMutuals = React.useCallback(
     (userIDsToFID: { +[userID: string]: string }) =>
       updateRelationships({
         action: relationshipActions.FARCASTER_MUTUAL,
         userIDsToFID,
       }),
     [updateRelationships],
   );
 
   const userInfos = useSelector(state => state.userStore.userInfos);
 
   const fid = useCurrentUserFID();
 
+  const unlinkFID = useUnlinkFID();
+
   const prevCanQueryRef = React.useRef<?boolean>();
 
   const handleFarcasterMutuals = React.useCallback(async () => {
     const canQuery = isActive && !!fid && loggedIn;
     if (canQuery === prevCanQueryRef.current) {
       return;
     }
     prevCanQueryRef.current = canQuery;
 
     if (
       !loggedIn ||
       !isActive ||
       !fid ||
       !neynarClient ||
       !getFarcasterUsers ||
       !currentUserID
     ) {
       return;
     }
 
     const followerFIDs = await neynarClient.fetchFriendFIDs(fid);
 
     const commFCUsers = await getFarcasterUsers(followerFIDs);
 
     const newCommUsers = commFCUsers.filter(({ userID }) => !userInfos[userID]);
 
     if (newCommUsers.length === 0) {
       return;
     }
 
     const userIDsToFID: { +[userID: string]: string } = Object.fromEntries(
       newCommUsers.map(({ userID, farcasterID }) => [userID, farcasterID]),
     );
 
     const userIDsToFIDIncludingCurrentUser: { +[userID: string]: string } = {
       ...userIDsToFID,
       [(currentUserID: string)]: fid,
     };
 
     void dispatchActionPromise(
       updateRelationshipsActionTypes,
       createThreadsAndRobotextForFarcasterMutuals(
         userIDsToFIDIncludingCurrentUser,
       ),
     );
   }, [
     isActive,
     fid,
     loggedIn,
     neynarClient,
     getFarcasterUsers,
     userInfos,
     dispatchActionPromise,
     createThreadsAndRobotextForFarcasterMutuals,
     currentUserID,
   ]);
 
   const handleUserStoreFIDs = React.useCallback(async () => {
     if (!loggedIn || !isActive || !findUserIdentities) {
       return;
     }
 
     const userStoreIDs = Object.keys(userInfos);
 
     const userIdentities = await findUserIdentities(userStoreIDs);
 
     const userStoreFarcasterUsers = Object.entries(userIdentities)
       .filter(([, identity]) => identity.farcasterID !== null)
       .map(([userID, identity]) => ({
         userID,
         username: identity.username,
         farcasterID: identity.farcasterID,
       }));
 
     dispatch({
       type: setAuxUserFIDsActionType,
       payload: {
         farcasterUsers: userStoreFarcasterUsers,
       },
     });
   }, [loggedIn, isActive, findUserIdentities, userInfos, dispatch]);
 
   const prevCanQueryHandleCurrentUserFIDRef = React.useRef<?boolean>();
-  const canQueryHandleCurrentUserFID = isActive && !fid && loggedIn;
+  const canQueryHandleCurrentUserFID = isActive && loggedIn;
 
   const handleCurrentUserFID = React.useCallback(async () => {
     if (
       canQueryHandleCurrentUserFID ===
       prevCanQueryHandleCurrentUserFIDRef.current
     ) {
       return;
     }
     prevCanQueryHandleCurrentUserFIDRef.current = canQueryHandleCurrentUserFID;
 
     if (
       !canQueryHandleCurrentUserFID ||
       !findUserIdentities ||
-      !currentUserID
+      !currentUserID ||
+      !neynarClient
     ) {
       return;
     }
 
+    if (fid) {
+      const isCurrentUserFIDValid =
+        await neynarClient.checkIfCurrentUserFIDIsValid(fid);
+
+      if (!isCurrentUserFIDValid) {
+        await unlinkFID();
+        return;
+      }
+
+      return;
+    }
+
     const currentUserIdentityObj = await findUserIdentities([currentUserID]);
     const identityFID = currentUserIdentityObj[currentUserID]?.farcasterID;
 
     if (identityFID) {
       dispatch({
         type: setSyncedMetadataEntryActionType,
         payload: {
           name: syncedMetadataNames.CURRENT_USER_FID,
           data: identityFID,
         },
       });
     }
   }, [
     canQueryHandleCurrentUserFID,
     findUserIdentities,
     currentUserID,
+    neynarClient,
+    fid,
+    unlinkFID,
     dispatch,
   ]);
 
   React.useEffect(() => {
     if (!usingCommServicesAccessToken) {
       return;
     }
 
     void handleFarcasterMutuals();
     void handleUserStoreFIDs();
     void handleCurrentUserFID();
   }, [handleCurrentUserFID, handleFarcasterMutuals, handleUserStoreFIDs]);
 
   return null;
 }
 
 export { FarcasterDataHandler };
diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js
index adbd25e9f..ca2155747 100644
--- a/lib/utils/neynar-client.js
+++ b/lib/utils/neynar-client.js
@@ -1,313 +1,335 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { getMessageForException } from './errors.js';
 import type {
   NeynarChannel,
   NeynarUser,
   NeynarUserWithViewerContext,
 } from '../types/farcaster-types.js';
 
 type FetchFollowersResponse = {
   +result: {
     +users: $ReadOnlyArray<NeynarUserWithViewerContext>,
     +next: {
       +cursor: ?string,
     },
   },
 };
 
 type FetchFarcasterChannelsResponse = {
   +channels: $ReadOnlyArray<NeynarChannel>,
   +next: {
     +cursor: ?string,
   },
 };
 
 type FetchFarcasterChannelByNameResponse = {
   +channels: $ReadOnlyArray<NeynarChannel>,
 };
 
 type FetchUsersResponse = {
   +users: $ReadOnlyArray<NeynarUser>,
 };
 
 type FetchFarcasterChannelInfoResponse = {
   +channel: NeynarChannel,
 };
 
 const neynarBaseURL = 'https://api.neynar.com/';
 const neynarURLs = {
   '1': `${neynarBaseURL}v1/farcaster/`,
   '2': `${neynarBaseURL}v2/farcaster/`,
 };
 function getNeynarURL(
   apiVersion: string,
   apiCall: string,
   params: { [string]: string },
 ): string {
   const neynarURL = neynarURLs[apiVersion];
   invariant(
     neynarURL,
     `could not find Neynar URL for apiVersion ${apiVersion}`,
   );
   return `${neynarURL}${apiCall}?${new URLSearchParams(params).toString()}`;
 }
 
 const fetchFollowerLimit = 150;
 const fetchFollowedChannelsLimit = 100;
 const fetchChannelsLimit = 50;
 
 class NeynarClient {
   apiKey: string;
 
   constructor(apiKey: string) {
     this.apiKey = apiKey;
   }
 
   // We're using the term "friend" for a bidirectional follow
   async fetchFriendFIDs(fid: string): Promise<string[]> {
     const fids = [];
     let paginationCursor = null;
 
     do {
       const params: { [string]: string } = {
         fid,
         viewerFid: fid,
         limit: fetchFollowerLimit.toString(),
         ...(paginationCursor ? { cursor: paginationCursor } : null),
       };
 
       const url = getNeynarURL('1', 'followers', params);
 
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchFollowersResponse = await response.json();
         const { users } = json.result;
 
         for (const user of users) {
           if (user.viewerContext.following) {
             fids.push(user.fid.toString());
           }
         }
 
         paginationCursor = json.result.next.cursor;
       } catch (error) {
         console.log(
           'Failed to fetch friend FIDs:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (paginationCursor);
 
     return fids;
   }
 
   async fetchFollowedFarcasterChannels(fid: string): Promise<NeynarChannel[]> {
     const farcasterChannels = [];
     let paginationCursor = null;
 
     do {
       const params: { [string]: string } = {
         fid,
         limit: fetchFollowedChannelsLimit.toString(),
         ...(paginationCursor ? { cursor: paginationCursor } : null),
       };
 
       const url = getNeynarURL('2', 'user/channels', params);
 
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchFarcasterChannelsResponse = await response.json();
 
         const { channels, next } = json;
 
         channels.forEach(channel => {
           farcasterChannels.push(channel);
         });
 
         paginationCursor = next.cursor;
       } catch (error) {
         console.log(
           'Failed to fetch followed Farcaster channels:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (paginationCursor);
 
     return farcasterChannels;
   }
 
   async fetchFarcasterChannelByName(
     channelName: string,
   ): Promise<?NeynarChannel> {
     const params: { [string]: string } = {
       q: channelName,
     };
 
     const url = getNeynarURL('2', 'channel/search', params);
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       const json: FetchFarcasterChannelByNameResponse = await response.json();
 
       const { channels } = json;
 
       for (const channel of channels) {
         if (channel.name.toLowerCase() === channelName.toLowerCase()) {
           return channel;
         }
       }
 
       return null;
     } catch (error) {
       console.log(
         'Failed to search Farcaster channel by name:',
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
 
   async getFarcasterUsernames(
     fids: $ReadOnlyArray<string>,
   ): Promise<Array<?string>> {
     const fidsLeft = [...fids];
     const results: Array<?string> = [];
     do {
       // Neynar API allows querying 100 at a time
       const batch = fidsLeft.splice(0, 100);
       const url = getNeynarURL('2', 'user/bulk', { fids: batch.join(',') });
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchUsersResponse = await response.json();
         const { users } = json;
 
         const neynarUserMap = new Map<number, NeynarUser>();
         for (const neynarUser of users) {
           neynarUserMap.set(neynarUser.fid, neynarUser);
         }
 
         for (const fid of batch) {
           const neynarUser = neynarUserMap.get(parseInt(fid));
           results.push(neynarUser ? neynarUser.username : null);
         }
       } catch (error) {
         console.log(
           'Failed to fetch Farcaster usernames:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (fidsLeft.length > 0);
     return results;
   }
 
   async getAllChannels(): Promise<Array<NeynarChannel>> {
     const farcasterChannels = [];
     let paginationCursor = null;
 
     do {
       const params: { [string]: string } = {
         limit: fetchChannelsLimit.toString(),
         ...(paginationCursor ? { cursor: paginationCursor } : null),
       };
 
       const url = getNeynarURL('2', 'channel/list', params);
 
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchFarcasterChannelsResponse = await response.json();
 
         const { channels, next } = json;
 
         channels.forEach(channel => {
           farcasterChannels.push(channel);
         });
 
         paginationCursor = next.cursor;
       } catch (error) {
         console.log(
           'Failed to fetch all Farcaster channels:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (paginationCursor);
 
     return farcasterChannels;
   }
 
   async fetchFarcasterChannelInfo(
     channelID: string,
     viewerFID: string,
   ): Promise<NeynarChannel> {
     const params: { [string]: string } = {
       id: channelID,
       type: 'id',
       viewer_fid: viewerFID,
     };
 
     const url = getNeynarURL('2', 'channel', params);
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       const json: FetchFarcasterChannelInfoResponse = await response.json();
 
       return json.channel;
     } catch (error) {
       console.log(
         'Failed to fetch Farcaster channel info:',
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
+
+  async checkIfCurrentUserFIDIsValid(fid: string): Promise<boolean> {
+    const url = getNeynarURL('2', 'user/bulk', { fids: fid });
+
+    try {
+      const response = await fetch(url, {
+        method: 'GET',
+        headers: {
+          Accept: 'application/json',
+          api_key: this.apiKey,
+        },
+      });
+
+      return response.ok;
+    } catch (error) {
+      console.log(
+        'Failed to check if current user FID is valid:',
+        getMessageForException(error) ?? 'unknown',
+      );
+      throw error;
+    }
+  }
 }
 
 export { NeynarClient };