How do I send a Messenger DM when someone comments on my Facebook post?

Before you start

• Connect your Facebook Page first. See How do I connect my Facebook Page?
• Facebook automations are on Legend Pro and above. On lower plans you’ll see ”🚀 Facebook Automation is Live!” with an upgrade button.

Steps

1. On Home, click New Automation.
2. Choose Comment to DM.
3. On “Which posts?”, pick where it runs:
   • Existing posts: click the Facebook pill, then click one or more Page posts.
   • All posts: every Page post, including new ones. Tick Facebook, or both Instagram and Facebook to set up both at once.
   • Next post: a post you haven’t published yet.
4. Click Next.
5. Under “What should it send?”, pick Send Link & PDF, Lead Gen or Flow Automation.
   • Lead Gen asks for a name, email or phone in the chat.
   • Flow Automation is a multi-step chat with buttons (Trendsetter and above). It’s hidden if you picked Instagram and Facebook together.
6. If you picked 2 or more posts, name the group, then click Publish Setup. The editor opens.
7. Add trigger words (or choose all comments), your public replies and the DM text.
8. Click Publish.

You can also go to Quick Automation, open the Facebook tab, and click a post under Facebook Posts.

On the phone app

Tap Facebook on Home. Tap a Page post, or use Quick Global Automation (all posts) or Next Post Automation. The editor is the same as for Instagram posts. Connecting the Page itself opens the website.

What your followers see

1. Your public reply appears under their comment, posted by your Page.
2. They get a private message from your Page in Messenger.

If someone comments twice, they get the DM twice.

Good to know

• For Next post on Facebook, you get a caption code to put in the Page post’s text, just like on Instagram. See How do I set up an automation before I post?
• There are no Stories, Live or Collabs for Facebook in InstantDM.
• Scheduling Facebook posts isn’t possible. Later is Instagram only.

What you can’t do

• Use the follow-first option on Facebook.
• Automate Facebook Story replies.
• Run one Flow on both Instagram and Facebook. Make one per platform.
• Automate comments on Facebook ads.

How to turn it off

Open the post’s automation and switch off its Send Link or PDF (or Lead Gen) card. See How do I turn off, edit or delete an automation?

If it doesn’t work

• No Facebook tab or posts → your Page isn’t connected, or the connection expired. Reconnect from Account Settings → Safety & Limits.
• Comments get the public reply but no Messenger DM → check the trigger words and your credits, then see Why didn’t my automation send a DM?