4chan?

I visited 4chan, i've seen some suff I shouldn't have, I googled it, and everything, but I still can not figure out what is it for. Why are people telling each other off anonymously? Or is it just overloaded with trolls, and I didn't see behind them? or what? Maybe if people would be a bit more civilised over there, it wouldn't be blocked?

Sorry, if I hurt anyone's feelings, I'm not trying to say anything good or bad about it, because I don't know it enough to judge, but the first impression kind of explained why would someone block it.

Is there anything I should know? (besides what I read on wikipedia, and Encyclopedia Dramatica)