Don't know about other servers, but on Cornelia if you go to Camp bearded Rock, there's a bot constantly spamming the chat with advertisement.
All you have to do is open your menu, click social lists, blacklists, and put in the name of the spambot. Et voila, they will disappear.
I realise alot of people don't need this tip but considering some of the silly (uninformed) comments in some of the hate threads I thought I'd point this out before someone says 'they don't even have chat filters to hide spam!'
Edited, Sep 5th 2010 7:06am by Tealtraum