4chan is the worst place on the goddamn internet. The fuckers there have been known to wreck lives and "invade" sites and forums. oh and chances are if you can think of an internet meme, it's been first done by a fucker from 4chan.
if you like random pics of gore and child porno, 4chan is for you.
rule 1 of internet: don't fuck with 4chan.
read more:
http://en.wikipedia.org/wiki/4chan