For as long as there have been blogs, there have been trolls. A troll is a commenter who hangs around your blog for the sheer purpose of annoying and goading you and your other readers.

Trolling is quite different from merely being critical. Obviously, not all of your readers are going to agree with you about everything, but a troll’s comments will rarely have anything to do with the topic at hand. For example, say you review a certain book you like. Someone might comment that she thinks it is an overrated work and doesn’t understand why anyone likes it. That’s not trolling. Even a comment as abrupt as “I’ve always hated that book” isn’t trolling, because, while it’s not particularly interesting, it’s at least a response to what you’ve written.

A troll, on other hand, is not actually trying to express anything. Rather, a troll is seeking to provoke…