To answer your question above ...
The word "Troll" comes from fishing. A fisherman who pulls bait, or a lure, behind a boat going through the water is trolling. That's just the fishing term for it. He hopes that fish will come and attack the bait; if they do, he can reel them in.
On the Net, a person who comes to a forum and makes a comment that's intended to "bait" others to respond is also said to be trolling. When people "take the bait," then he can reel them in like a fish that's been hooked.
There's also a play on words involved. Northern European folklore includes characters called trolls. In some old stories, they live under bridges, and they attack and eat people, goats, or other creatures who try to cross the bridges. They're reputed to be very ugly, strong and stupid, and they are associated with rocks and earth.
At some point during the old days of Usenet, people started to use the word "trolls" to refer to those who "trolled" for responses from unsuspecting users by posting statements or questions which were inflammatory, outrageous or
disingenuous and insincere.
See also
http://www.jargon.8hz.com/jargon_35.html#SEC42
Here endeth the lesson.
{/Pompous Terminology Historian Hat OFF}