1.(n) -A pathetic and moronic person who maintains a blog with an unhealthy obsessive-compulsive drive, especially angsty goths (sorry to all the likeable goths out there). The content of their blogs usually includes events that no sane person would care about. Here's sample of what a blog troll might write on their blog:
"today, I ate a sanwich. It bad - it was just ok, mediocre, I guess you could call it. After that I read a few chapters out of an Anne Rice book and was deeply moved by her erotic descriptions of gay vampires fornicating. <Insert narciccistic remark here>. Then I took a nap.

2.(n) -A depraved individual who sits in front of a computer all day and posts flames of an idiotic or pseudo-intellectual nature on public forums and private websites. Many of these people actually become emotional about what is said on the afore-said mediums and feel it is their duty to punish those who disagree with them. They too may pursue this object in an obsessive-compulsive manner.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

To hide under a bridge of the information superhighway known to be travelled by your sworn enemies, waiting to pounce at an opportune moment with senseless attacks and irrational rants.

similar to a message board troll but one that puts a lot of untrue things about a person on their blog and pass it off as truth.