I'm not sure what else it was
and I'd bet money that it doesn't happen much on any forums where there are usernames and offline contacts.
( Flapjack I spay a little mare for you, Wed 3 Jun 2009, 16:42, archived)

the complete lack of rules and moderation were probably a larger factor
since you can post anonymously anywhere, all you need is an email address
( well, Wed 3 Jun 2009, 16:48, archived)