Misuse of Yahoo! Answers is handled by a user moderation system, where users report posts that are in breach of guidelines or the Terms of Service. Posts are removed if they receive sufficient weight of trusted reports (reports from users with a reliable reporting history). Deletion may be appealed: an unsuccessful appeal receives a 10-point penalty; a successful one reinstates the post and reduces the 'trust rating' (reporting power) of the reporter. If a user receives a large number of violations in a relatively short amount of time or a very serious violation, it can cause the abuser's account to be suspended. In extreme, but rare cases (for a Terms of Service violation), the abuser's entire Yahoo! ID will be suddenly deactivated without warning.