Facebook SDK for Android

Are you feeling ambitious? If so, you might want to tackle the task of creating the next best Facebook application, but maybe you don't know where to begin. The Facebook Android SDK enables you to integrate Facebook functionality into your application easily. You can use it to authorize users, make API requests, and much more! Integrate all the Facebook goodness without breaking a sweat. Source code: http://github.com/facebook/facebook-android-sdk.