How to post to Facebook from ChatGPT, and schedule the posts

Set it up and post, step by step

Prompt to copy once your Page is connected: Write a Facebook post about our Saturday open day, show it to me, and schedule it for Friday at 9:00 New York time.

1. Add PostWire as a custom connector

   If your ChatGPT plan offers developer mode, turn it on under Settings → Security and login, then under Settings → Connectors add a custom connector with the URL https://postwire.io/api/mcp and sign in when asked (OAuth). Menu names in ChatGPT change often; OpenAI's help page has the current path. PostWire is not in ChatGPT's app directory yet (submitted to OpenAI's review on Sept 27, 2026). Not available on your plan? Use PostWire in Claude, where it is in the connector directory.

2. Sign in with your email

   A 6-digit code creates your free PostWire account inside the sign-in window: no password and no card. ChatGPT asks you to confirm a write action such as publishing before it runs.

3. Connect your Facebook Page

   Ask "connect my Facebook Page". The connector calls create_connect_link and returns a one-hour link. Facebook shows "Continue as <your name>", then asks which Pages PostWire may use: tick the Page you want to post to and press Save. Pages you manage directly and Pages inside a Business Portfolio both appear. No Page yet? Create one at facebook.com/pages/create first.

4. Ask for the post

   "Write a Facebook post about our Saturday open day." generate_posts returns a draft and publishes nothing. It is written for Facebook: 40 to 80 characters when the idea allows and under 250 otherwise, the hook in the first 125 characters (where the mobile feed cuts), 1 to 3 hashtags, and a link can stay in the body. Ask for the Instagram or LinkedIn version in the same message and each comes back written for that network.

5. Add a photo or a video, if you want one

   A file attached to a ChatGPT message does not reach a connector, so ask for an upload link: create_upload_link returns a page where you pick the file on the phone or laptop that has it (up to 100 MB on the free plan and 1 GB on paid plans); say "uploaded" and the assistant reads it with get_uploaded_file. A public https link to an image or a video works too.

6. Publish now, or schedule it

   Say "post it" and the assistant calls post_to_social. Say "schedule it for Friday at 9:00 New York time" and it calls schedule_post with that time; "put it in my next free slot" uses run_at: "next_slot". This is the call:

   {
     "name": "schedule_post",
     "arguments": {
       "platforms": ["facebook"],
       "per_platform": { "facebook": { "text": "Open day this Saturday, 10 to 2. Coffee is on us ☕ #openday" } },
       "photo_url": "https://postwire.io/m/…/open-day.jpg",
       "run_at": "2026-10-23T09:00:00-04:00"
     }
   }

7. Check the queue, and open the post

   "What's scheduled on Facebook?" calls list_scheduled_posts, and "cancel Friday's post" calls cancel_scheduled_post. Once a post is out, the result carries its link (https://facebook.com/…) and the Page it went to, and get_post_performance ranks your Facebook posts by reactions, comments and shares.

Nothing is published before you say yes: the assistant shows the exact text first, and ChatGPT asks you to confirm the write action. The same queue is on the dashboard's Queue page, with Reschedule and Cancel. Prefer to set it up by hand first? Open the dashboard, connect the account under Accounts and copy your key under API & MCP.