4chan.org/b - the original home of Anonymous, this video is on the top of the page
http://www.youtube.com/watch?feature=player_embedded&v=QoAvlvhQHX0#!
The /b/ board gets thousands of posts a day and lots of viewers that dont post called 'lurkers'
Pretty good advertisement
Please dont go on 4chan.org/b unless you have a strong stomach.