A public reply under every comment
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The Public reply step answers under the comment on Instagram or Facebook with one of up to five variations picked at random, starting with @their name. Paired with a private reply, as in comment to DM, it tells everyone else to check their DMs.
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In public, in their name
A different variation for each comment, posted as your page, with a mention.
- 01
Under their comment
The reply posts under the comment that started the flow, as your page, where everyone reading sees it.
- 02
A different one each time
Up to five variations, one picked at random for each comment, so a busy post never shows the same reply fifty times.
CommentWatchDog: 5 variations, 500 characters each
- 03
They are mentioned
“Mention them” is on by default: on Instagram the reply starts with @their username, so they are notified.
- 04
Then the private reply
A public reply goes alongside the one private reply Meta allows per comment, before or after it.
The reply, and Meta’s rules
Each setting, and the Meta rule the builder follows for you.
What it says
- Add variationVariations
Up to five ways to reply. “One variation is picked at random each time, so the replies don’t look automated.”
CommentWatchDog: 5 variations
- Length
Up to 500 characters each. Meta documents no limit for a comment reply; 500 is ours, so a reply always reads as a reply.
Meta documents no length; 500 is CommentWatchDog’s
- Mention themTheir name first
On by default. On Instagram “the reply starts with @their username, so they’re notified.” On Facebook the reply mentions them by name.
- Their name and words
Variables such as {{first_name}} and {{comment}} fill in when the reply is posted.
Meta’s rules it follows
- Comment starts only
A public reply needs a comment to reply to, so it appears in flows that start on a comment, on posts, reels and ads.
- Replies to replies
On Instagram a reply to a reply lands under the top-level comment: Instagram threads only one level deep.
Meta: Instagram replies to top-level comments
- Not under a hidden comment
Instagram refuses replies to hidden comments, so a flow that hides the comment and then replies in public is refused when you save it.
Meta: you cannot reply to hidden comments on Instagram
- Alongside the private reply
It does not use up the one private reply Meta allows per comment: both can go.
On every comment start
Public replies go where comments start a flow: posts, reels and ads.
The Public reply step, as you set it
The step selected on the canvas, its panel open with the variations and Mention them.
- Variations
- Up to 5, picked at random.
- Mention them
- On by default.
Every rule, and who sets it
Meta’s rules on comment replies and the caps CommentWatchDog keeps.
| What | The limit | Set by |
|---|---|---|
| Variations | 5 per step | CommentWatchDog |
| Length | 500 characters each | CommentWatchDog |
| Replies to a reply on Instagram | Land under the top-level comment | |
| Hidden comments on Instagram | Cannot be replied to | |
| Instagram Live comments | Cannot be replied to |
Meta’s rules are from the Instagram comment replies reference (Graph API), October 2026. Meta documents no length for a reply.
Questions people ask
Short answers before you start.
Yes. Write up to five variations and one is picked at random for each comment, so the replies under a busy post don’t look automated.
“Mention them” is on by default. On Instagram the reply starts with @their username, so they are notified. On Facebook the reply mentions them by name.
Up to 500 characters for each variation. Meta documents no length for comment replies; 500 is CommentWatchDog’s own cap.
Yes. The public reply posts under the comment and does not use up the one private reply Meta allows per comment, so a flow can do both.
Not on Instagram: Instagram refuses replies to hidden comments, so the builder refuses a flow that hides the comment and then replies under it. See Hide the comment.
For real questions under a post, yes: AI replies to comments answer from your knowledge on the moderation side. The Public reply step posts your own words.
Yes. A public reply works on any comment a flow starts on: Instagram and Facebook posts, reels and ads.