In games like Mafia Wars, Farmville, YoVille and Vampires Live, you know, some of the major sources of all those garbage announcements cluttering up your Facebook, players compete to complete missions and level up. By leveling up, you can complete more difficult missions and fight off weaker opponents. You can wait for your various energies to regenerate naturally over time, or you can purchase with real money in-game boosts. Or, you can complete various lead generation offers, many of which are of the "answer page after page of questions and opt in and out of receiving various kinds of spam" variety. Some of them install malware and adware that is impossible to remove. And some of them secretly subscribe you to monthly recurring $9.99 credit card charges.