Think fishing.
Trolling on the 'net is basically posting something designed to get people riled up up, contentions from the start, ie, casting bait for a reaction.

from wiki
Quote:
An Internet troll, or simply troll in Internet slang, is someone who posts controversial and usually irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the intention of baiting other users into an emotional response[1] or to generally disrupt normal on-topic discussion.[2]
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tips for making gear