My favorite application on Facebook at the moment is Mafia Wars. It’s pretty addictive. I stumbled on it by clicking an ad while playing in another app. In the game you start a virtual crime family with your friends. You earn money and respect buy doing virtual crime jobs, fighting other mafia families, and buying property. Your money is spent building and maintaining your arsenal of weapons and defenses. Mafia Wars is a detailed, well thought-out game, and a simple and fun way to pass the time. Check it out!