I'm on a few music forums and one of them is so bad I'm almost afraid to post - if you accidentally duplicate a thread you get a reprimand from the mods. If you prefer one band member over another it becomes a biatchfest
I used to be on the official forum for my favourite band and we self moderated until a troll started causing all sorts of trouble. The powers that be there decided that proper moderators were needed from amongst the ranks but the two chosen were two of the worst trouble makers on the board and they made life miserable for everybody as the power went to their heads. I made a comment on another private forum (independent of the official forum) about how bad the situation was which was copied and sent the management of the official forum and now I'm banned
Having said that, they lost so many members they've recently revamped the forum to encourage a few more members in