There was a thread a few weeks ago in the general forum regarding World of Warcraft. Someone reacted negatively to some of the criticisms in that thread, and posted snippets of that over on Blizzard's official forums to his WoW buddies.
That got enough WoW players riled up to create accounts here and spam the general forum with a bunch of junk posts. This was over the previous weekend I believe, and someone was able to catch on and ban/lock the offending posts/posters.
I'm sure it was just a vocal minority, I played the game for a number of months and generally ran into a decent crowd.