Can you build it? Yes, you can.
Facebook Developers have released the Facebook Connect for iPhone SDK, which lets your app link to the popular social networking site. With it, third-party coders can let their customers:
- Seamlessly connect their Facebook account and information with an iPhone app
- Connect and share experiences with friends who also use the app
- Share user information and actions on the app with friends on Facebook
Connect is a Cocoa library that is added to your
iPhone app client to provide authentication, extended permissions and
Feed form functionality. It includes iPhone styled "Connect with Facebook" and "Logout" buttons. The Facebook Platform automatically handles user authentication and distribution of Feed stories.
[Via Facebook Developers]