This is kind of ironic,
ludwig, but this has already been said before! Re-read my post (below), which first appeared on
this thread.
A good idea would be to have a "report" function. If, say, five individual members hit the "report" button on a post, then the offending post would be sent to, say, five moderators by e-mail. If, say, four out of five moderators agreed that it was offensive and against the rules of AnswerBank, then it would be automatically deleted.
This is nothing new, I've seen it on lots of sites and I've even been a moderator of this kind.