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
@@ -162,8 +162,6 @@
     let searchComponent = null;
     if (searching) {
       const { userInfoInputArray, genesisThreadInfo } = this.props;
-      // It's technically possible for the client to be missing the Genesis
-      // ThreadInfo when it first opens up (before the server delivers it)
       let parentThreadHeader;
       if (threadTypeIsThick(threadInfo.type)) {
         parentThreadHeader = (
@@ -175,6 +173,8 @@
           />
         );
       } else if (genesisThreadInfo) {
+        // It's technically possible for the client to be missing the Genesis
+        // ThreadInfo when it first opens up (before the server delivers it)
         parentThreadHeader = (
           <ParentThreadHeader
             parentThreadInfo={genesisThreadInfo}
@@ -380,13 +380,17 @@
     const { editInputMessage } = inputState;
     const resolveToUser = React.useCallback(
       async (user: AccountUserInfo) => {
-        const usersSupportingThickThreads = await checkUsersThickThreadSupport([
-          user.id,
-        ]);
+        const newUserInfoInputArray = user.id === viewerID ? [] : [user];
+        const usersSupportingThickThreads = await checkUsersThickThreadSupport(
+          newUserInfoInputArray.map(userInfo => userInfo.id),
+        );
         const resolvedThreadInfo = existingThreadInfoFinder({
           searching: true,
-          userInfoInputArray: [user],
-          allUsersSupportThickThreads: usersSupportingThickThreads.has(user.id),
+          userInfoInputArray: newUserInfoInputArray,
+          allUsersSupportThickThreads:
+            user.id === viewerID
+              ? true
+              : usersSupportingThickThreads.has(user.id),
         });
         invariant(
           resolvedThreadInfo,
@@ -398,6 +402,7 @@
       },
       [
         checkUsersThickThreadSupport,
+        viewerID,
         editInputMessage,
         existingThreadInfoFinder,
         setParams,
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
@@ -9,6 +9,7 @@
 
 import { createTagInput } from '../components/tag-input.react.js';
 import UserList from '../components/user-list.react.js';
+import { useSelector } from '../redux/redux-utils.js';
 import { useStyles } from '../themes/colors.js';
 
 const TagInput = createTagInput<AccountUserInfo>();
@@ -58,6 +59,7 @@
       return [userListItemsArr, nonFriendsSet];
     }, [userSearchResults, userInfoInputArray]);
 
+    const viewerID = useSelector(state => state.currentUserInfo?.id);
     const onUserSelect = React.useCallback(
       async (userInfo: AccountUserInfo) => {
         for (const existingUserInfo of userInfoInputArray) {
@@ -65,7 +67,7 @@
             return;
           }
         }
-        if (nonFriends.has(userInfo.id)) {
+        if (nonFriends.has(userInfo.id) || userInfo.id === viewerID) {
           await resolveToUser(userInfo);
           return;
         }
@@ -79,6 +81,7 @@
         updateTagInput,
         resolveToUser,
         updateUsernameInput,
+        viewerID,
       ],
     );
 
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
@@ -97,19 +97,25 @@
     async (userListItem: UserListItem) => {
       const { alert, notice, disabled, ...user } = userListItem;
       setUsernameInputText('');
-      if (notice === notFriendNotice && userInfoInputArray.length === 0) {
-        const newUserInfoInputArray = [
-          { id: userListItem.id, username: userListItem.username },
-        ];
+      if (
+        (notice === notFriendNotice || user.id === viewerID) &&
+        userInfoInputArray.length === 0
+      ) {
+        const newUserInfo = {
+          id: userListItem.id,
+          username: userListItem.username,
+        };
+        const newUserInfoInputArray = user.id === viewerID ? [] : [newUserInfo];
         const usersSupportingThickThreads = await checkUsersThickThreadSupport(
           newUserInfoInputArray.map(userInfo => userInfo.id),
         );
         const threadInfo = existingThreadInfoFinderForCreatingThread({
           searching: true,
           userInfoInputArray: newUserInfoInputArray,
-          allUsersSupportThickThreads: newUserInfoInputArray.every(userInfo =>
-            usersSupportingThickThreads.has(userInfo.id),
-          ),
+          allUsersSupportThickThreads:
+            user.id === viewerID
+              ? true
+              : usersSupportingThickThreads.has(user.id),
         });
         dispatch({
           type: updateNavInfoActionType,
@@ -133,6 +139,7 @@
     [
       checkUsersThickThreadSupport,
       dispatch,
+      viewerID,
       existingThreadInfoFinderForCreatingThread,
       pushModal,
       userInfoInputArray,