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http://www.iexploit.org/showthread.php?tid=2348
We've had several cases of this in SO. Particularly by a guy called Jettra there. He first signed up trying to talk to us about a hacking olympics. Later on, when people started debating, he registered several other accounts that came to his support. Wasn't an admin then, nor a mod, but I was able to detect it easily. I mean come on, 1 post, and your first post supports a guy being argued against by the community? :P
Just a personal experience of such a douchebag.