What is a troll and would I or you be classed as one?

[Riki]

Internet trolls are people who create problems for others on different sites while contributing nothing positive. There are many on Yahoo Answers, they report extremely small violations, which in many cases aren't even violations; they also give "thumbs down" constantly often with no valid reason. Because of trolls, to protect yourself, if you haven't done so already, you may find it best to edit your info to keep your questions and answers hidden that makes it tougher them to stalk you around the site. You can also change your avatar and i.d.or post in other than your usual categories. Trolls often hang out at controversial sections such as religion, homosexuality and polls, when someone posts what they disagree with, they report them.

http://en.wikipedia.org/wiki/Troll_(Internet)
According to yahoo: A "troll" is someone who intentionally and persistently posts inflammatory messages about sensitive topics to bait users into responding or provoke a confrontation. We also consider people to be trolls when they persistently misuse product features such as the ratings system to negatively target others.
I know I'm not one. If you fit the description then quite possibly you are a troll.