NEW YORK — Facebook has revealed for the first time just what, exactly, is banned on its service in a new Community Standards document released on Tuesday. It’s an updated version of the internal rules the company has used to determine what’s allowed and what isn’t, down to granular details such as what, exactly, counts as a “credible threat” of violence. The previous public-facing version gave a broad-strokes outline of the rules, but the specifics were shrouded in secrecy for most of Facebook’s 2.2 billion users.Not anymore. Here are just some examples of what the rules ban. Note: Facebook has not changed the actual rules — it has just made them public.