Automate Facebook with ChatGPT
Facebook gives you more room than every other platform here combined, and the smallest image ceiling of any of them.
https://api.antwork.io/mcpChatGPT reaches Antwork through a custom app in Developer mode. It is the longest setup of any client here, and the only one where you build the connector yourself rather than pasting a single line.
Custom connectors are a paid ChatGPT feature, and Developer mode has to be switched on first.
Connect it
What you can say once Facebook is connected
What is different about Facebook
Room you will never fill
Facebook takes sixty three thousand characters, more than twenty times what LinkedIn allows. The agent writes to what the post needs rather than to a ceiling, because here the ceiling is not a real constraint.
The image ceiling is link-preview sized
Facebook's image ceiling is 1200 by 630, the smallest of any platform Antwork posts to. Anything larger leans on their resize, so the agent says so before it attaches rather than after it looks soft in the feed.
It takes formats nothing else will
Facebook is the only platform here that accepts .bmp, it takes .webp, and it will read nine different video containers. If you have an awkward file left over from somewhere else, this is where it goes through.
Ten images, or one video
A post can carry ten images. It cannot carry images and a video at once, so a mixed batch becomes two posts and the agent tells you which is which.
Facebook limits, as the server enforces them
Posts are capped at 63,206 characters, and the cap is enforced when you schedule or publish, not silently truncated.
- Max size
- 4 MB
- Per post
- 10
- Ceiling
- up to 1200x630
- Max size
- 1 GB
- Per post
- 1
- Ceiling
- 20 min max
- — 10 media items per post, in total.
- — Images and video can never share a post. Ask for both and it has to be split into two.
These numbers are read at build time from the same rules file the publishers validate against, so this page cannot claim a limit the server does not enforce.
Questions
- Do I need an API key to connect ChatGPT?
- No. Antwork connects over OAuth — you approve a consent screen in the browser and you are done. There is no key to generate or paste into a URL, which is how most social MCP servers handle it.
- Do I need a paid account?
- No. The free tier covers one workspace, two connected accounts and 20 posts per cycle, and there is no plan gate on MCP access.
- Will ChatGPT post without showing me first?
- Not unless you ask it to. Drafting and publishing are two separate steps: the agent writes, renders the post card, and only publishes when you confirm.
- Does the writing sound like AI?
- Antwork learns a voice profile per connected account by reading what you have already published there, and the agent drafts from that profile. On Facebook that includes writing to the length the format rewards, up to 63,206 characters.
Never leave ChatGPT to post again.
One command, one consent screen, and Facebook is something you can just ask for.