a troll is a bored person who hides behind a screen name and (sometimes pretends to be someone else and) just writes garbage for fun to have fun on a blog fro example.
according to wikipedia:
In internet slang, a troll is a person who posts inflammatory, insincere, digressive, extraneous, or off-topic messages in an online community, with the intent of provoking readers into displaying emotional responses, or manipulating others’ perception.
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