I previously covered two other advertising networks for Facebook (one and two). According to VentureBeat, RockYou, a leader in Facebook applications, has just launched their own ad network. Their applications are being used by between 6 and 12 million users and they are leveraging that widespread adoption to provide advertisers with a new platform to spread their message. So far, this has been the most effective method for monetizing an application that I have seen. VentureBeat is reporting that the application installation page is bringing in $20 per 1000 installations which is extremly high. Given that most of the applications are growing at around one percent per day this would result in close to $2,000 worth of revenue per day for RockYou. If you can come up with an insanely effective method of driving people to your application, it looks like you can make around $100,000 per year. Not bad! It will be interesting to see how this pans out in the rapidly changing environment of Facebook advertising.