The online-newspaper I'm reading has a web-section and in the last weeks it was full of 4chan. I hadn't even heard about them before. So I went there and did see a lot of porny pictures and anonymous hate posts.
I understand they inventented or popularized Rickrolling and Lolcats but I don't really get it. It seems to me that their only merit is being many and thus, behaving like anonymous lemmings, they are able to make some impact on the net.
My favorite part of the wikipedia-article is about the founder of 4chan, "moot":