spoddy

According to The Free Dictionary, "spod" is British slang for someone "who spends an inordinate amount of time exchanging remarks in computer chatrooms or participating in discussions in newsgroups or on bulletin boards."

I suppose there had to be a word for it.

(SPOD is, of course, also an abbreviation for the Spinning Pizza Of Death, the wait cursor that appears in Mac OS X when an application is temporarily or permanently nonresponsive.)

I encountered "spoddy" in a hecklerspray item about the upcoming Simpsons movie, which referred to the also upcoming Halo movie as "a spoddy videogame movie."