Games you can play over Facebook such as Mafia wars, Farmville, and Cafe World. They are for people with no real skill at actual computer games and constantly feed annoying and pointless status updates to your news feed.
Farmville player's auto news update: "Idiot found a black sheep and it's very lonely and looking for a home!!!!!"
Sensible Facebook user: "Facebook games are fucking stupid." *blocks Farmville*