Troll Definition

Here's the definition of "troll" that was provided on the Black Hawk Zone forum of which I was a moderator:

A troll  does nothing but attempt to rankle posters and incite
arguments at every turn. They do nothing to add to the discussion.  
Instead they force their views down the throats of others, while
supplying little fact or knowledge to back up their arguments. When asked
to substantiate their opinion with fact or stats, you'll normally see
them either disappear or ignore the question all together.

There's nothing wrong with changing one's mind, as long as the opinion
you're changing is not one that you've tried to beat other posters to
death with.