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A known Facebook post or reel URL leads to post detail. Comments and transcript are enrichment views of that post; ad-library search is a different discovery domain. Choose based on whether you are investigating a public conversation or finding advertising, rather than assuming one search covers both.
The URL above is a placeholder. Use an actual returned public URL. A post read may request a first set of comments or a transcript with --include comments or --include transcript; these can add provider work. For a fuller or separately paged discussion, inspect facebook.post.comments.read and pass the post URL or the returned feedback-id as its contract allows. facebook.post.transcript.read is a separate operation for a post or reel URL. A transcript is text evidence, not video bytes. Ad search uses its own operation and filters:
Inspect the ad result’s country, status, dates and original ad identity before making a claim about active advertising. A provider’s current ad record and a past post are different evidence. Facebook profile, group, reels and advertiser collections have distinct contracts; the source directory points to discovery, and web describe gives exact current selectors. One representative post read passed in September 2026; that does not establish that every post, enrichment or ad query will succeed.