Battle.net

Blizzard Entertainment's online servers, over which games like Warcraft, Starcraft and Diablo can be played against people from all over the world.

The idea of spamming fans of a particular character or game is most commonly associated with Battle.net, the assumption being that if enough annoying halfwits post "HEY GUYZ VOTE 4 DIABLO ON GAMEFAQS.COM" every thirty seconds in every single server/room/game currently being played, hordes of people will come and vote for them. Or, possibly, vote against them just to piss off the spammers.

Battle.net is believed to have been responsible for the surprising strength of Starcraft in SC2K4. It may also have affected Diablo and Sarah Kerrigan.