Create a comment thread
Create a new comment thread on a draft. A comment thread is the anchored discussion container; comments are the messages inside the thread.
For post platforms (x, linkedin, mastodon, threads, bluesky, substack), provide post_index and anchor to a substring of that post's visible text using selected_text. Use occurrence to disambiguate when the same substring appears more than once; omit it to anchor on the first match.
For X Articles, send platform: "x_article" and omit post_index (or use 0). selected_text matches rendered article text in document order; Markdown syntax, media tags, and X post embed tags are ignored. X Article text comments cannot overlap existing stored X Article anchors; overlapping selections return 400 VALIDATION_ERROR.
LinkedIn mentions appear in posts[*].text as @[Name](urn:li:organization:ID) or @[Name](urn:li:person:ID). A mention is indivisible — selected_text must either contain the entire mention substring or stay outside it.
Required permission: WRITE access to this social set.
Path parameters
Request body
Response
Created