Ho to make money off Facebook applications

Hi all,

I'm thinking of buying a database of music lyrics and making it a FB application. I notices some sites that look like shit but have a bunch of songs in their database and their position being pretty high on Alexa and I'm thinking that Facebook could offer a nice way to engage people. Sooo... here's the question:
- How do people make money from FB apps other than some kind of in-app purchases. I guess google ads aren't an option. Some third party ads maybe? Some CPA programs?

Anyone has some experience?

Cheers

hi,
First off all NEVER expose your niche!
Now i dont have any expirience on that but i can share a list of Ad Providers that are allowed by Facebook
developers.facebook.com/docs/adproviders/

Cheers mate... Well, it's not so much a niche as much it is a language-specific project .