If you are one of those people who create apps for Facebook, here's a way you can make some money off your apps. RockYou Ads has a large amount of ads that you can use on your Facebook app pages.

"RockYou has created an ad network on Facebook and are offering publishers of all sizes the opportunity to serve ads from their extensive advertiser base." ~Rodney Rumford, FaceReviews

Just put a couple of these ads on your Facebook app page and start earning ad revenue right away. These ads are optimized to be used on Facebook. This means more money for you.