http://en.wikipedia.org/wiki/Internet_troll
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"Do not feed the trolls" redirects here. For the Wikipedia essay, see Wikipedia:What is a troll?.
An Internet troll, or simply troll in Internet slang, is someone who intentionally posts controversial messages in an on-line community such as an on-line discussion forum with the intention of baiting other users into an argumentative response.[1] "Troll" is also used in a broader pejorative sense to question the good faith of any Internet user who has annoyed the person using the term.
See also baiting
http://en.wikipedia.org/wiki/Baiting_%28Internet%29