diff --git a/keyserver/src/responders/farcaster-webhook-responders.js b/keyserver/src/responders/farcaster-webhook-responders.js
index 41833ec6f..b56501d60 100644
--- a/keyserver/src/responders/farcaster-webhook-responders.js
+++ b/keyserver/src/responders/farcaster-webhook-responders.js
@@ -1,302 +1,323 @@
 // @flow
 
 import { createHmac } from 'crypto';
 import type { $Request } from 'express';
 import invariant from 'invariant';
 
 import bots from 'lib/facts/bots.js';
+import { inviteLinkURL } from 'lib/facts/links.js';
 import { extractKeyserverIDFromID } from 'lib/keyserver-conn/keyserver-call-utils.js';
 import { createSidebarThreadName } from 'lib/shared/sidebar-utils.js';
 import { type NeynarWebhookCastCreatedEvent } from 'lib/types/farcaster-types.js';
 import { messageTypes } from 'lib/types/message-types-enum.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
 import { type NewThreadResponse } from 'lib/types/thread-types.js';
 import { neynarWebhookCastCreatedEventValidator } from 'lib/types/validators/farcaster-webhook-validators.js';
 import { ServerError } from 'lib/utils/errors.js';
 import { assertWithValidator } from 'lib/utils/validation-utils.js';
 
 import {
   getFarcasterChannelTagBlob,
   createOrUpdateFarcasterChannelTag,
   farcasterChannelTagBlobValidator,
 } from '../creators/farcaster-channel-tag-creator.js';
 import { createOrUpdatePublicLink } from '../creators/invite-link-creator.js';
 import createMessages from '../creators/message-creator.js';
 import { createThread } from '../creators/thread-creator.js';
 import { fetchServerThreadInfos } from '../fetchers/thread-fetchers.js';
 import { createBotViewer } from '../session/bots.js';
 import { createScriptViewer } from '../session/scripts.js';
 import {
   changeRole,
   commitMembershipChangeset,
 } from '../updaters/thread-permission-updaters.js';
 import { updateRole, joinThread } from '../updaters/thread-updaters.js';
 import { thisKeyserverAdmin, thisKeyserverID } from '../user/identity.js';
 import { getFarcasterBotConfig } from '../utils/farcaster-bot.js';
 import { getVerifiedUserIDForFID } from '../utils/farcaster-utils.js';
 import { neynarClient } from '../utils/fc-cache.js';
 import { getNeynarConfig } from '../utils/neynar-utils.js';
 
 const taggedCommFarcasterInputValidator =
   neynarWebhookCastCreatedEventValidator;
 const threadHashTagRegex = /\B#createathread\b/i;
 
 const noChannelCommunityID = '80887273';
 const { commbot } = bots;
 const commbotViewer = createBotViewer(commbot.userID);
 
 async function createCastSidebar(
   sidebarCastHash: string,
   channelName: ?string,
   channelCommunityID: string,
   taggerUserID: ?string,
 ): Promise<?NewThreadResponse> {
   const sidebarCast =
     await neynarClient?.fetchFarcasterCastByHash(sidebarCastHash);
 
   if (!sidebarCast) {
     return null;
   }
 
   const castAuthor = sidebarCast.author.username;
   const channelText = channelName ? ` in channel ${channelName}` : '';
   const messageText = `${castAuthor} said "${sidebarCast.text}"${channelText}`;
 
   let viewer = commbotViewer;
   if (taggerUserID) {
     viewer = createScriptViewer(taggerUserID);
     await joinThread(viewer, {
       threadID: channelCommunityID,
     });
   } else {
     const changeset = await changeRole(
       channelCommunityID,
       [commbot.userID],
       -1,
     );
     await commitMembershipChangeset(viewer, changeset);
   }
 
   const [{ id: messageID }] = await createMessages(viewer, [
     {
       type: messageTypes.TEXT,
       threadID: channelCommunityID,
       creatorID: viewer.id,
       time: Date.now(),
       text: messageText,
     },
   ]);
 
   invariant(
     messageID,
     'message returned from createMessages always has ID set',
   );
   const sidebarThreadName = createSidebarThreadName(messageText);
 
   const response = await createThread(
     viewer,
     {
       type: threadTypes.SIDEBAR,
       parentThreadID: channelCommunityID,
       name: sidebarThreadName,
       sourceMessageID: messageID,
     },
     {
       addViewerAsGhost: !taggerUserID,
     },
   );
 
   return response;
 }
 
 async function createTaggedFarcasterCommunity(
   channelID: string,
   taggerUserID: ?string,
 ): Promise<NewThreadResponse> {
   const keyserverAdminPromise = thisKeyserverAdmin();
 
   const neynarChannel =
     await neynarClient?.fetchFarcasterChannelByID(channelID);
   if (!neynarChannel) {
     throw new ServerError('channel_not_found');
   }
 
   const leadFID = neynarChannel.lead.fid.toString();
   const [leadUserID, keyserverAdmin] = await Promise.all([
     getVerifiedUserIDForFID(leadFID),
     keyserverAdminPromise,
   ]);
 
   const communityAdminID = leadUserID
     ? leadUserID
     : taggerUserID || keyserverAdmin.id;
 
   const initialMemberIDs = [
     ...new Set([leadUserID, taggerUserID, communityAdminID].filter(Boolean)),
   ];
 
   const newThreadResponse = await createThread(
     commbotViewer,
     {
       type: threadTypes.COMMUNITY_ROOT,
       name: neynarChannel.name,
       initialMemberIDs,
     },
     {
       forceAddMembers: true,
       addViewerAsGhost: true,
     },
   );
 
   const { newThreadID } = newThreadResponse;
   const fetchThreadResult = await fetchServerThreadInfos({
     threadID: newThreadResponse.newThreadID,
   });
   const threadInfo = fetchThreadResult.threadInfos[newThreadID];
 
   if (!threadInfo) {
     throw new ServerError('fetch_failed');
   }
 
   const adminRoleID = Object.keys(threadInfo.roles).find(
     roleID => threadInfo.roles[roleID].name === 'Admins',
   );
 
   if (!adminRoleID) {
     throw new ServerError('community_missing_admin');
   }
 
   await updateRole(commbotViewer, {
     threadID: newThreadID,
     memberIDs: [communityAdminID],
     role: adminRoleID,
   });
 
   await createOrUpdateFarcasterChannelTag(commbotViewer, {
     commCommunityID: newThreadResponse.newThreadID,
     farcasterChannelID: channelID,
   });
 
   return newThreadResponse;
 }
 
 async function verifyNeynarWebhookSignature(
   signature: string,
   event: NeynarWebhookCastCreatedEvent,
 ): Promise<boolean> {
   const neynarSecret = await getNeynarConfig();
   if (!neynarSecret?.neynarWebhookSecret) {
     throw new ServerError('missing_webhook_secret');
   }
 
   const hmac = createHmac('sha512', neynarSecret.neynarWebhookSecret);
   hmac.update(JSON.stringify(event));
 
   return hmac.digest('hex') === signature;
 }
 
 async function taggedCommFarcasterResponder(req: $Request): Promise<void> {
   const { body } = req;
 
   const event = assertWithValidator(body, taggedCommFarcasterInputValidator);
   const {
     author: { fid: eventTaggerFID },
     text: eventText,
     channel: eventChannel,
   } = event.data;
 
   const foundCreateThreadHashTag = threadHashTagRegex.test(eventText);
 
   if (!foundCreateThreadHashTag) {
     return;
   }
 
+  const neynarConfigPromise = getNeynarConfig();
   const taggerUserIDPromise = getVerifiedUserIDForFID(
     eventTaggerFID.toString(),
   );
 
   const signature = req.header('X-Neynar-Signature');
   if (!signature) {
     throw new ServerError('missing_neynar_signature');
   }
 
   const [isValidSignature, farcasterBotConfig] = await Promise.all([
     verifyNeynarWebhookSignature(signature, event),
     getFarcasterBotConfig(),
   ]);
 
   if (!isValidSignature) {
     throw new ServerError('invalid_webhook_signature');
   }
 
   const eventChannelID = eventChannel?.id;
   const isAuthoritativeFarcasterBot =
     farcasterBotConfig.authoritativeFarcasterBot;
 
   if (!eventChannelID && !isAuthoritativeFarcasterBot) {
     return;
   }
 
   let channelCommunityID = noChannelCommunityID;
   if (eventChannelID) {
     const blobDownload = await getFarcasterChannelTagBlob(eventChannelID);
     if (blobDownload.found) {
       const blobText = await blobDownload.blob.text();
       const blobObject = JSON.parse(blobText);
       const farcasterChannelTagBlob = assertWithValidator(
         blobObject,
         farcasterChannelTagBlobValidator,
       );
 
       const { commCommunityID } = farcasterChannelTagBlob;
       const commCommunityKeyserverID =
         extractKeyserverIDFromID(commCommunityID);
       const keyserverID = await thisKeyserverID();
 
       if (keyserverID !== commCommunityKeyserverID) {
         return;
       }
       channelCommunityID = commCommunityID.split('|')[1];
     } else if (!blobDownload.found && blobDownload.status === 404) {
       if (!isAuthoritativeFarcasterBot) {
         return;
       }
 
       const taggerUserID = await taggerUserIDPromise;
       const newThreadResponse = await createTaggedFarcasterCommunity(
         eventChannelID,
         taggerUserID,
       );
       channelCommunityID = newThreadResponse.newThreadID;
     } else {
       throw new ServerError('blob_fetch_failed');
     }
   }
 
   const { hash: castHash, parent_hash: parentHash } = event.data;
   const taggerUserID = await taggerUserIDPromise;
 
   // we use the parent cast to create the sidebar source message if it exists
   const sidebarCastHash = parentHash ?? castHash;
   const sidebarThreadResponse = await createCastSidebar(
     sidebarCastHash,
     eventChannel?.name,
     channelCommunityID,
     taggerUserID,
   );
 
   if (!sidebarThreadResponse) {
     return;
   }
 
   const inviteLinkName = Math.random().toString(36).slice(-9);
-  const inviteLink = await createOrUpdatePublicLink(commbotViewer, {
-    name: inviteLinkName,
-    communityID: channelCommunityID,
-    threadID: sidebarThreadResponse.newThreadID,
-  });
 
-  console.log(inviteLink);
+  const [inviteLink, neynarConfig] = await Promise.all([
+    createOrUpdatePublicLink(commbotViewer, {
+      name: inviteLinkName,
+      communityID: channelCommunityID,
+      threadID: sidebarThreadResponse.newThreadID,
+    }),
+    neynarConfigPromise,
+  ]);
+
+  const introText = 'I created a thread on Comm. Join the conversation here:';
+  const replyText = `${introText} ${inviteLinkURL(inviteLink.name)}`;
+
+  if (!neynarConfig?.signerUUID) {
+    throw new ServerError('missing_signer_uuid');
+  }
+
+  const postCastResponse = await neynarClient?.postCast(
+    neynarConfig.signerUUID,
+    castHash,
+    replyText,
+  );
+
+  if (!postCastResponse?.success) {
+    throw new ServerError('post_cast_failed');
+  }
 }
 
 export { taggedCommFarcasterResponder, taggedCommFarcasterInputValidator };