Facebook is a platform which helps you grow your mobile app’s install base, and re-engage your existing users. Learn more about Facebook Platform for Android by reading the Getting Started guide:
 
https://developers.facebook.com/docs/mobile/android/build/.
 
You’ll also want to download and install Facebook’s SDK for Android:
 
https://developers.facebook.com/docs/reference/androidsdk/
 
Once you’re up and running, you should consider integrating your app with Facebook’s Open Graph to increase distribution from Facebook to your Android app. Get started with the Open Graph by following this guide:
 
https://developers.facebook.com/docs/opengraph/tutorial/
 
Finally, you can learn about how to add your Facebook-enabled Android app to the App Center to drive additional installs of your app:
 
https://developers.facebook.com/docs/appcenter/