Canadian Politics Today

I'm old school, but in the beginnings of message boards, trolls were people who said ridiculously antagonistic with the simple objective to get a rise out of people.  They don't often stick around, but sit back and watch all the people getting mad at their posts.   

This is pretty much the whole internet's definition of trolling. Insulting people isn't trolling (necessarily), and bringing up something new isn't trolling (necessarily) and no, calling people leftists or rightists isn't trolling even if it includes a generalization about them.