Eharding is more of a menace than a mere troll (though he is by far the worst), so I guess I'd say Atheist2006 and his various sock accounts.
Who was that? And what did they do?
Did Atheist2006 post 50 times a day?
he used to send about 50 DM's a day to all remotely prominent members filled with so much NSFW images that many of us stopped opening up Atlas in public because we would see a barrage of threads of Goatse style shock images. (he sent his images under usernames of other people, so you would open a DM from, like, Bacon King and see his garbage).
He also made a poll saying whether it would be funny if I was raped by a syrian refugee...
Jesus....
He also, according to Mr. Morden, made about 70 sock accounts one time someone made an "Opinion of" thread just so he could get 70 FF votes.
You really gotta wonder about some of the people who go on this site...