Growing Up Internet Addicted

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Troll

A user who incites or engages in disruptive behavior (trolling). There are some people who enjoy causing conflict, and there are those who make a hobby of it. However, these are few in number and one should always assume good faith in other editors. Calling someone a troll in a dispute is a bad idea; it has an effect similar to calling someone a Nazi – no further meaningful debate is likely to occur.

http://en.wikipedia.org/wiki/Wikipedia:Glossary#T