It is only natural that at some point you will get griefers at any popular building. We had two recently. The last one was an Estonian guy nicknamed Zac. His hunger for attention is as big as his desire to jump on the tables and wear women's clothes. Since I have promised that we will document negative issues too, he gets a bit of attention here.
Griefers are an interesting phenomenon. According to Wikipedia, a griefer is a slang term used to describe a player in an multiplayer video game who plays the game simply to cause grief to other players through harassment. Although there are not many of them, they can spoil the experience of using the internet environments. But do not get it wrong, most people online are still talented and nice!
By Estonian Embassy rules, griefers can be muted, voted out by residents or if in violation with Second Life Community rules, they can be removed by the moderator.