diff --git a/lib/shared/user-utils.js b/lib/shared/user-utils.js
--- a/lib/shared/user-utils.js
+++ b/lib/shared/user-utils.js
@@ -2,13 +2,14 @@
 
 import * as React from 'react';
 
+import { extractFIDFromUserID } from './id-utils.js';
 import { roleIsAdminRole } from './thread-utils.js';
 import { useResolvableNames } from '../hooks/names-cache.js';
 import type {
   ThreadInfo,
   RawThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
-import type { UserInfo } from '../types/user-types.js';
+import type { AccountUserInfo, UserInfo } from '../types/user-types.js';
 import { useSelector } from '../utils/redux-utils.js';
 
 function ensNameForFarcasterUsername(farcasterUsername: string): string {
@@ -68,9 +69,46 @@
   return adminUserInfoWithENSName;
 }
 
+function useFindExistingUserForFid(): (
+  userInfo: AccountUserInfo,
+) => ?AccountUserInfo {
+  const auxUserInfos = useSelector(state => state.auxUserStore.auxUserInfos);
+  const userInfos = useSelector(state => state.userStore.userInfos);
+
+  const fidToExistingUserIDMap: Map<string, string> = React.useMemo(() => {
+    const map = new Map<string, string>();
+    for (const userID of Object.keys(auxUserInfos)) {
+      if (auxUserInfos[userID].fid) {
+        map.set(auxUserInfos[userID].fid, userID);
+      }
+    }
+    return map;
+  }, [auxUserInfos]);
+
+  return React.useCallback(
+    (userInfo: AccountUserInfo) => {
+      const fid = extractFIDFromUserID(userInfo.id);
+      if (!fid) {
+        return null;
+      }
+      const userID = fidToExistingUserIDMap.get(fid);
+      if (!userID) {
+        return null;
+      }
+      return {
+        ...userInfo,
+        ...userInfos[userID],
+        username: userInfos[userID].username ?? userInfo.username,
+      };
+    },
+    [fidToExistingUserIDMap, userInfos],
+  );
+}
+
 export {
   ensNameForFarcasterUsername,
   stringForUser,
   stringForUserExplicit,
   useKeyserverAdmin,
+  useFindExistingUserForFid,
 };
diff --git a/native/chat/message-list-thread-search.react.js b/native/chat/message-list-thread-search.react.js
--- a/native/chat/message-list-thread-search.react.js
+++ b/native/chat/message-list-thread-search.react.js
@@ -6,6 +6,7 @@
 import { useResolvableNames } from 'lib/hooks/names-cache.js';
 import { extractFIDFromUserID } from 'lib/shared/id-utils.js';
 import { notFriendNotice } from 'lib/shared/search-utils.js';
+import { useFindExistingUserForFid } from 'lib/shared/user-utils.js';
 import type { AccountUserInfo, UserListItem } from 'lib/types/user-types.js';
 import { useIsFarcasterDCsIntegrationEnabled } from 'lib/utils/services-utils.js';
 
@@ -63,17 +64,22 @@
     }, [userSearchResults, userInfoInputArray]);
 
     const viewerID = useSelector(state => state.currentUserInfo?.id);
+    const findExistingUserForFid = useFindExistingUserForFid();
     const onUserSelect = React.useCallback(
-      async (userInfo: AccountUserInfo) => {
+      async (selectedUserInfo: AccountUserInfo) => {
         for (const existingUserInfo of userInfoInputArray) {
-          if (userInfo.id === existingUserInfo.id) {
+          if (selectedUserInfo.id === existingUserInfo.id) {
             return;
           }
         }
-        const isFarcasterUser =
-          supportsFarcasterDCs && !!extractFIDFromUserID(userInfo.id);
+        const isFarcasterOnlyUser =
+          supportsFarcasterDCs && !!extractFIDFromUserID(selectedUserInfo.id);
+        let userInfo: AccountUserInfo = selectedUserInfo;
+        if (isFarcasterOnlyUser) {
+          userInfo = findExistingUserForFid(userInfo) ?? userInfo;
+        }
         if (
-          (!isFarcasterUser && nonFriends.has(userInfo.id)) ||
+          (!isFarcasterOnlyUser && nonFriends.has(userInfo.id)) ||
           userInfo.id === viewerID
         ) {
           await resolveToUser(userInfo);
@@ -84,13 +90,14 @@
         updateTagInput(newUserInfoInputArray);
       },
       [
-        userInfoInputArray,
+        supportsFarcasterDCs,
         nonFriends,
+        viewerID,
+        userInfoInputArray,
+        updateUsernameInput,
         updateTagInput,
+        findExistingUserForFid,
         resolveToUser,
-        updateUsernameInput,
-        viewerID,
-        supportsFarcasterDCs,
       ],
     );
 
diff --git a/web/chat/chat-thread-composer.react.js b/web/chat/chat-thread-composer.react.js
--- a/web/chat/chat-thread-composer.react.js
+++ b/web/chat/chat-thread-composer.react.js
@@ -25,6 +25,7 @@
 } from 'lib/shared/thread-utils.js';
 import { dmThreadProtocol } from 'lib/shared/threads/protocols/dm-thread-protocol.js';
 import { getProtocolByName } from 'lib/shared/threads/protocols/thread-protocols.js';
+import { useFindExistingUserForFid } from 'lib/shared/user-utils.js';
 import type { AccountUserInfo, UserListItem } from 'lib/types/user-types.js';
 import { useDispatch } from 'lib/utils/redux-utils.js';
 import { useIsFarcasterDCsIntegrationEnabled } from 'lib/utils/services-utils.js';
@@ -109,22 +110,29 @@
     selectedProtocol,
   );
 
+  const findExistingUserForFid = useFindExistingUserForFid();
   const onSelectUserFromSearch = React.useCallback(
     async (userListItem: UserListItem) => {
-      const { alert, notice, disabled, ...user } = userListItem;
+      const { alert, notice, disabled, supportedProtocols, ...user } =
+        userListItem;
       setUsernameInputText('');
-      const isFarcasterUser =
-        isFarcasterDCsIntegrationEnabled && !!extractFIDFromUserID(user.id);
+      const fid = extractFIDFromUserID(user.id);
+      const isFarcasterOnlyUser = isFarcasterDCsIntegrationEnabled && !!fid;
+      let selectedUser: AccountUserInfo = user;
+      if (isFarcasterOnlyUser) {
+        selectedUser = findExistingUserForFid(user) ?? selectedUser;
+      }
       if (
-        ((!isFarcasterUser && notice === notFriendNotice) ||
+        ((!isFarcasterOnlyUser && notice === notFriendNotice) ||
           user.id === viewerID) &&
         userInfoInputArray.length === 0
       ) {
         const newUserInfo = {
-          id: userListItem.id,
-          username: userListItem.username,
+          id: selectedUser.id,
+          username: selectedUser.username,
         };
-        const newUserInfoInputArray = user.id === viewerID ? [] : [newUserInfo];
+        const newUserInfoInputArray =
+          selectedUser.id === viewerID ? [] : [newUserInfo];
 
         const threadInfo = existingThreadInfoFinderForCreatingThread({
           searching: true,
@@ -142,7 +150,7 @@
         dispatch({
           type: updateNavInfoActionType,
           payload: {
-            selectedUserList: [...userInfoInputArray, user],
+            selectedUserList: [...userInfoInputArray, selectedUser],
           },
         });
       } else {
@@ -150,12 +158,13 @@
       }
     },
     [
+      isFarcasterDCsIntegrationEnabled,
       viewerID,
       userInfoInputArray,
+      findExistingUserForFid,
       existingThreadInfoFinderForCreatingThread,
       dispatch,
       pushModal,
-      isFarcasterDCsIntegrationEnabled,
     ],
   );