Why are certain people internet trolls?

 Why do some people troll? I wonder what they get out of it. Maybe they're just looking for attention. I think that's why they do it. 

I mean, why troll people, unless you just want attention? I don't see how they enjoy messing with people. Seems a little weird. 

Why they do it

I guess trolls are sometimes jealous of others' successes. I think that's what it boils down to. The moral of the story is, don't be a troll!