This user seems to be abusing Stack Overflow.
If you read this chat transcript, near the beginning he claimed he has 5 SO accounts. Is there a way to determine if that is true? I would also be surprised if he hasn't used his multiple accounts to earn reputation. I noticed at 12:34 PM (UTC) today he received 6 upvotes in a minute. The spam filter didn't seem to catch them.
I have no proof that he is cheating, but he did say himself that he has 5 accounts. He is also pretty unruly in the chat rooms, and has spammed the chat rooms with flags and stars, and posted inappropriate pictures and messages. He's been banned several times from the chat rooms, but it hasn't helped much.
Is there a way to merge/disable his other profiles? IMO, he should be put on 'probation', though that might be impossible, or overly harsh.
Suspected accounts so far: