Personally, I "troll" in real life. It's usually among friends and just taunting them, lying to them, etc, for the purpose of teasing them. They're trolls too, and it's a bit of a game between us.
Really, in communities I frequent, there are so many trolls, we troll them back. Perhaps we're using the term differently from how pg is?
I went camping with a group of lawyers once, and they were a lot like this too. They wanted to constantly argue and debate. They would even assert things that I knew they personally disagreed with, just to start an argument. If nobody was arguing, they'd get kind of tense and nervous as if some calamity was about to happen, and then starting a debate seemed to relieve everyone's tension. Seemed strange to me.
Really, in communities I frequent, there are so many trolls, we troll them back. Perhaps we're using the term differently from how pg is?