App Logo
facebook.com

Comment on a Facebook post

Automatically comment on a Facebook post on facebook.com. Leave a comment on a Facebook post, as the identity the browser is currently signed in as. Pass the post's URL and the comment text. If a comment with exactly the same text is already loaded on the post, nothing is posted again. After posting, the comment is looked up on the page to confirm it is really visible, and the account that posted it is echoed back so you can tell which identity was used. Works in any interface language.

Input

text required

The comment text to publish

postUrl required

Full URL of the Facebook post to comment on

Output

posted required
accountId required

Numeric id of the identity that published, read from the live session

commentUrl required

Link to the comment itself: the one just posted, or the identical comment or reply that was already there.

alreadyPresent required

A comment or a reply with this text was already loaded on the post, so nothing was published

verifiedOnPage required

The comment was found on the page after publishing

text optional

FAQ

Leave a comment on a Facebook post, as the identity the browser is currently signed in as. Pass the post's URL and the comment text. If a comment with exactly the same text is already loaded on the post, nothing is posted again. After posting, the comment is looked up on the page to confirm it is really visible, and the account that posted it is echoed back so you can tell which identity was used. Works in any interface language.
Ask an AI agent connected to Reduck to run reduck/facebook.com/comment_on_post, or run it from a terminal with the Reduck CLI: npx @reduck-ai/cli@latest run --script reduck/facebook.com/comment_on_post
You do not need one. "Comment on a Facebook post" drives the real facebook.com pages in a browser, so it works whether or not facebook.com offers an API for this.
Required: postUrl, text.
It returns text, posted, accountId, commentUrl, alreadyPresent, verifiedOnPage.
Yes. It acts as you on facebook.com: on your own Chrome it reuses your session, and on a Reduck-hosted browser it loads the facebook.com cookies saved by the Reduck extension.
It makes changes on facebook.com, like sending, posting, booking or buying something.
Ask an AI agent connected to Reduck to run reduck/facebook.com/comment_on_post, or run it from a terminal with the Reduck CLI: npx @reduck-ai/cli@latest run --script reduck/facebook.com/comment_on_post
It is part of Reduck's official curated catalogue.

Related scripts

facebook.com

Get Facebook profile info

Get header and intro info for a Facebook profile or page (pass a URL or a bare id/username). Returns the type (profile or page), the name, friends, likes and follower counts as displayed, mutual friends, and the intro lines: bio, then city, work and education for people or the description for pages, then links and contact lines. Counts come back as the strings Facebook shows (e.g. "11 K") and intro lines are returned as they appear, not sorted into fields. Works in any interface language. An id or username Facebook will not serve returns a clear error rather than an empty record.

facebook.com

Search Facebook Marketplace listings

Search Facebook Marketplace listings by keyword, with the site's filters: place, price range, sort order, condition, listing age, delivery method, availability and category. Returns each listing's id, link, title, price, city, photo, seller, listing date and status. Without locationId the search uses the account's current Marketplace place and radius; get ids from suggest_marketplace_locations and category ids from list_marketplace_categories. Results load by scroll: count caps how many are returned and complete is true only when Facebook had no more to give. An empty list means nothing matched.

facebook.com

Find Facebook groups by keyword

Find Facebook groups by keyword with member counts and posting activity, as structured data. Search Facebook groups by keyword. Returns groupId, name, url, privacy, members, postsPerDay. Results are infinite-scroll, capped by limit.

Start building not clicking

Get started for free