> When a post is down-voted or flagged, a self-cleaning procedure is triggered by other users, so quality posts and comments tend to float to the top. The firs

> When a post is down-voted or flagged, a self-cleaning procedure is triggered by other users, so quality posts and comments tend to float to the top. The first part is correct, the second part is correct in theory, but any place that has "upvotes" (like HN or reddit) ends up with the community putting straight up incorrect stuff as the "top comment". So while "far up in the comment thread" can signal quality, accuracy and truth, you'd be mistaken to automatically assume so. HN is, after all, just another community on the website filled with humans who can be wrong.