Can you use ManyChat on normal sales objective Facebook ads?

You can run normal Facebook ads (image or video) and still trigger ManyChat automation, but you need to use specific entry points.

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what are the specific entry points?

Yes, you can absolutely use normal Facebook image/video ads and still trigger ManyChat automation. There are two main ways to do it:

Option 1 — Comment trigger on your ad post

Set up a Facebook Comments trigger in ManyChat (Automations → + New Automation → "User comments on your post"). Select your ad post from the "Promotable posts" tab, this works with ads, dark posts, and regular posts. Set a keyword trigger so when someone comments a specific word on your ad, ManyChat auto-sends them a Messenger DM. This is great because you keep running a normal image/video ad while collecting leads through comments.

Option 2 — Click-to-Messenger ad with ManyChat as the partner app

In Ads Manager, choose the "Send message" CTA button. Under Message Template, select "Partner app" and choose ManyChat from the dropdown. Then select the automation/flow you built in ManyChat. The ad looks like a normal image or video ad but when they click the button it opens your ManyChat flow in Messenger.

One heads up: if you boost a post instead of running it as a proper ad through Ads Manager, comment automations break due to Meta's restrictions. Always run it through Ads Manager directly.

Option 1 is probably what you're looking for since you specifically don't want Messenger ads — your ad stays a normal image/video ad and the automation fires from comments.