Mafia Wars!

Mafia Wars is set in , with the option for players to travel between New York and Cuba once they reach level 35. The game revolves around doing jobs to earn cash and advancing one's criminal empire. Players can also create mafias by recruiting players. Social networking sites such as Facebook, MySpace and Friendster allow players to recruit from within their friends network to build their mafia and fight against other players.] Players can also improve their stats by visiting the Godfather or making a micropayment..

Gameplay revolves around timers: players have limited energy, health, and stamina meters that slowly fill up over time. Using other mafia members that they have recruited, players can also fight other mafias. This results in the stealing of cash from the attacked mafia. The game operates on a level up basis. The player earns experience points by completing jobs. As they level up, more jobs become available, and extra features become available, such as robbing other mafias and visiting Cuba to expand their criminal empire.

Removed from Wikipedia

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Great game, good to when you're bored at home/work :P