How to automatically reply to Facebook Page comments and Messenger DMs

!Glossy magenta tubes turning a dropped capsule into an envelope, illustrating auto replies to Facebook comments and DMs

Connect your Facebook Page to a tool that reads comments and Messenger DMs through Meta's official API, then pick a keyword and write the message it sends. In BetterSocials, someone comments the word, your link lands in their Messenger, and their comment gets a public reply. If you only get a few messages a day, Meta Business Suite is free and handles the Messenger basics, so start there.

The short answer

Meta Business Suite covers simple Messenger replies for free, like an instant reply when someone writes to your Page for the first time. For a keyword comment that sends a link by DM, plus AI drafts for the comments and messages a keyword doesn't catch, you need a tool built on Meta's API.

BetterSocials is one of them. It runs keyword comment-to-DM on Facebook and Instagram with one keyword and one message. On TikTok, YouTube, Threads and LinkedIn company pages, the keyword gets a public reply that carries the link instead.

How do I automatically reply to Facebook Page comments and Messenger DMs?

You have two real options.

The first is Meta Business Suite. It's free, it's Meta's own, and its inbox automations can answer Messenger messages for you.

The second is a tool that connects to your Page through Meta's API. ManyChat is one: you connect your Page and build the automation as a flow. BetterSocials does the same job without the flow. You set one keyword and the message it sends. Someone comments the keyword, your link lands in their Messenger, and the comment gets a public reply.

The bigger difference is the bill. ManyChat bills by active contacts each month, and extra contacts are charged monthly even on annual plans. BetterSocials charges a flat price with unlimited contacts, unlimited DMs and unlimited keyword automations. More comments don't make your bill bigger.

YouTube is the other gap to check. ManyChat has no YouTube channel. BetterSocials brings your YouTube comments into the same inbox and answers a keyword there with a public reply that carries your link. YouTube has no DM API for any tool, so a public reply is the only way to answer.

Pick by volume. A few messages a day, and Meta's free tools will probably do. If comments pile up under your posts and people wander off before you answer, set up a keyword.

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

Use a keyword. Someone comments a set word under your post. The tool replies to that comment in public and sends the person a private Messenger DM with your link. This is called comment-to-DM.

If Meta's own inbox automations already do what you need on your Page, use them. They're free. If you want one keyword that works the same way on Facebook and Instagram, with everything else your accounts receive sitting in one inbox, this is the setup in BetterSocials.

Connect your account

Connect your Facebook Page. You sign in on Facebook's own screen, so your password never reaches BetterSocials. It has to be a Page: personal Facebook profiles are not a channel.

Set a keyword and a message

Pick the word you want people to comment, for example "PRICE" or "LINK". Write the DM it sends, with your link, and the public reply. That's the whole setup. There's no flow to build.

Let it run

From then on, every comment with that keyword gets your public reply and your DM, exactly as you wrote them. Comments that don't match land in your inbox, where the AI drafts a reply in your voice. You approve it, or you set a rule that lets that kind of reply go out on its own.

Instagram works the same way. TikTok doesn't: a TikTok comment can't trigger a private DM on any tool, apart from TikTok's limited rollout in Vietnam, Thailand and Indonesia. So on TikTok the keyword gets a public reply with the link. YouTube works like TikTok here, because YouTube has no DM API for any tool.

How to automate Facebook Page comments and Messenger instant replies with Meta Business Suite

Meta Business Suite is free and official, and for the basics it's good. In your Page's inbox settings you can turn on automations such as:

• An instant reply when someone messages your Page for the first time
• An away message for when you're closed
• Answers to questions people ask a lot

Meta's help center explains how to switch each one on. Before you pay for anything, check what these automations can do with comments on your Page. If they cover it, you're done.

Business Suite is built for Meta's own apps. If you also answer people on TikTok, YouTube, Threads or a LinkedIn company page, you'll want those comments in the same inbox as your Facebook ones, with drafts written in your voice. That's the point where a tool like BetterSocials earns its price.

How to use the Meta Messenger API for private replies to Page comments and messages

The Messenger API is how software, instead of a person sitting in your inbox, reads your Page's comments and sends Messenger DMs. It's what a comment-to-DM tool connects to.

Building on it yourself means writing code, handling Meta's permissions and keeping up with Meta's rules for automated messages. One rule applies to every tool: a reply has to land inside the platform's messaging window. Answer late and the DM may not go through at all.

If you're not a developer, skip the build. BetterSocials connects your Page through Meta's official API, so one keyword sends the public reply and the private DM and you never write a line of code.

How BetterSocials does this

Connect a channel

Go to Connected Accounts, pick Facebook and sign in on Facebook's screen. Instagram, TikTok, YouTube, Threads and LinkedIn company pages connect from the same place, and their comments land in the same inbox. DMs come in from Instagram, Facebook and TikTok. On TikTok you can reply to a DM but can't start one.

Set one keyword and one message

A keyword and the message it sends is the whole automation. Use it for a booking link or a discount code. Keywords are unlimited on every plan, so give each offer its own word.

Read replies in your voice

For everything a keyword doesn't cover, the AI drafts a reply in your voice, built from your own past replies. You can add rules in plain words, such as "never quote prices, send people to the booking link". You still approve each draft, unless you've set a rule that lets a kind of reply send on its own.

The price is flat and published. Creator is $29 a month ($24 a month billed yearly) for 4 social accounts. Pro is $49 a month ($39 a month billed yearly) for 5. Both are one seat. Team is $99 a month ($79 a month billed yearly) for 10 accounts and unlimited team members. Every plan has unlimited contacts, DMs and keyword automations. AI credits cover the AI writing only, and when they run out the AI pauses instead of charging you more.

On bans: no tool can honestly promise your Page will never be restricted, and BetterSocials doesn't try. It uses Meta's official API and states the limits as they are.

Start your 7-day trial (a card is required, cancel any time), or see how it compares with ManyChat.