somethingawful.com and fark.com are also pretty powerful, it seems like any site where memes come from is strong.

4chan.org was quite trivial. Got it with yahoo.com, powered up to max damage. I stole 'Too Much Information' from facebook.com in order to have level 2 attack on yahoo.com though.

4chan.org vs ycombinator.com - that was a long fight. 4chan.org ended up being on top :)