A Messenger chatbot for your Facebook Page
Free for 7 days, no credit card required
People message your Page at night, on weekends, from an ad. An unanswered Messenger chat is a booking somewhere else. CommentWatchDog answers it on Meta’s Messenger Platform and hands the hard ones to your team.
- Meta's official API, no password, nothing installed
- Unlimited contacts on every plan
- AI replies in your customer's language
- From $29 a month
A chatbot live in four steps
CommentWatchDog runs Messenger automation for Facebook Pages through Meta’s Messenger Platform: a Messenger reply when someone comments on a post or ad, keyword auto replies, a welcome menu with ice breakers, m.me links that start a flow, AI answers from your knowledge, and a shared inbox for your team.
- 01
Connect the Page
Sign in with Facebook’s own login and pick the Facebook Page whose Messenger you want to answer.
Meta’s official API, no password
- 02
Pick what starts it
A comment on a post or an ad, a Messenger keyword, your m.me link, or the first message and ice breakers.
Four starts on Messenger
- 03
Build the conversation
Messages with quick replies, questions that save the answer, AI answers from your knowledge, a hand-off to your team.
No code; or describe it and Build with AI
- 04
Switch it on
Go live and the chats it starts land in your team’s inbox beside Instagram’s.
Unlimited contacts on every plan
Every start and rule, in the app’s words
What the flow builder offers on a Facebook Page, and the Meta rule behind each. Instagram has two more starts: see Instagram DM automation.
What starts a Messenger chatbot
Four starts on a Facebook Page, each with Meta’s rule.
- Post or ad commentsComment to Messenger
A keyword or any comment under a post or an ad sends the one private reply to the commenter’s Messenger. See comment to DM.
One private reply per comment, within 7 days. A Page cannot private-reply to another Page.
- Messenger messageKeyword auto replies
Someone writes a keyword, or anything at all, and gets its answer at once; up to 50 keywords, capitals and accents ignored.
- m.me linkYour m.me link
m.me/your-page?ref=name opens Messenger and starts the flow, from an ad, an email or a QR code; the app writes the Get Started button for it. See m.me links.
Meta does not guarantee the link’s name on every device.
- Ice breakers and first messagesA welcome menu
Up to 4 questions above an empty Messenger chat, each with its own way out, or a welcome on the first message. See the welcome message and ice breakers.
Ice breakers take the place of the Get Started button.
What Messenger allows
More room than Instagram, and one thing Instagram refuses.
- MessageLonger messages
Up to 2,000 characters a message, up to 3 buttons and up to 13 quick replies.
640 characters with buttons; 20 a button.
- Ask a questionEmail and phone in one tap
Asked for an email or a phone number, Messenger offers the person’s own as a one-tap reply when their profile has one; the answer is saved on the contact.
Instagram refuses these one-tap replies.
- CardsA carousel
Up to 10 cards in one message, each with an image, an 80-character title, a line and buttons.
Messenger crops card images to 1.91:1.
What Messenger does not share
So a Messenger flow is built differently from an Instagram one.
- Messenger shares only their nameName and picture only
Messenger shares a person’s name and picture, not followers or a verified badge, so there are no profile rules or follow checks here; what they tell you is saved as they answer.
- Shared postNo story or shared-post starts
Story replies, mentions and shared posts start flows on Instagram only; a Page’s Messenger has the four starts above.
- Hand to a personA person when it matters
A hand-off step pauses the automation in that chat and notifies your team; the chat waits in the Live inbox with everything the bot said.
Meta asks bots to offer a way to reach a person.
- AI agent answersAI answers from your knowledge
Your AI agent answers questions from your site, files and FAQs in the customer’s language, and hands the chat over when it does not know.
5 AI credits an answer.
Your team picks up where it stopped
Messenger chats land in the Live inbox beside Instagram’s, each answer labelled by who sent it.
- Who answered
- Automation, AI agent or a teammate, on every message.
- Take over
- Pause for 24 hours in a chat while a person answers.
Messenger’s numbers, in one table
What Meta allows in a Messenger chat, and the caps the builder adds.
| What | The limit | Set by |
|---|---|---|
| Who writes first | The person: a comment, a message, a tap or a link open | |
| Private replies per comment | One, within 7 days of the comment | |
| Reply window | 24 hours after their last message, tap or link open | |
| One message | 2,000 characters; 640 with buttons | |
| Buttons and quick replies | Up to 3 buttons, up to 13 quick replies, 20 characters each | |
| Cards in a carousel | Up to 10; 80-character title and line | |
| Ice breakers | Up to 4 questions, 80 characters each | |
| What a person shares | Their name and picture | |
| Keywords per start | Up to 50, 80 characters each | CommentWatchDog |
| Contacts and DMs | Unlimited, on every plan | CommentWatchDog |
Meta’s numbers: the Messenger Platform send, templates, quick replies, private replies and ice breakers references. No Meta page states Messenger’s 2,000 characters today; it was sent live: 2,000 passed and 2,001 was refused. CommentWatchDog’s numbers are the builder’s own caps.
Messenger and Instagram, one tool
Many DM tools stop at Instagram. CommentWatchDog runs your Page’s Messenger and your Instagram from one builder and one inbox, and Facebook comment moderation comes in every plan.
CommentWatchDogOr no AI agent at allNo Facebook posts or adsFrom each tool’s own pricing and help pages, October 2026. Logos belong to their owners.
Questions about Messenger chatbots
What Page owners ask before they turn it on.
Connect your Facebook Page with Facebook’s own login, pick what starts it (a comment, a keyword, your m.me link or the first message and ice breakers), then build the conversation on the canvas or start from a template such as Welcome menu. No code; you can also describe it in a sentence and Build with AI.
Meta Business Suite’s automated responses send set replies to common moments, such as an instant reply, an away message or answers to frequently asked questions (Meta’s help page). CommentWatchDog adds flows that branch, questions that save answers, conditions, AI answers from your own knowledge, HTTP requests and comment to Messenger, with a team inbox. What Facebook’s own automations do, and where they stop, is on the Facebook auto reply page.
Yes. A comment on your post or ad can send the commenter a private reply in Messenger, one per comment and within 7 days of it, as Meta allows; once they answer or tap, the rest of the conversation follows.
No. Meta lets a Page message a person only within 24 hours of their last message, tap or link open, so there are no broadcasts to past contacts. Everything the chatbot sends is an answer to something the person did.
Not on its own. When a flow asks for an email or a phone number, Messenger offers the person’s own as a one-tap reply if their profile has one, and the answer is saved on the contact. Otherwise Messenger shares only their name and picture.
Yes. It runs on Meta’s Messenger Platform within its rules: the person writes first, replies go inside the 24-hour window, bots answer quickly and offer a way to reach a person, which the hand-off step and the Live inbox give you.