BitDate is a small Tinder clone for Android.
It uses Parse for the backend to store users, uses Facebook Sign-in to register users, and uses Firebase for realtime chat communication between users.
It also has a Tinder-esque UI as well including the motion gestures to like and dislike users. Also learned how to use Viewpager, DrawerLayout and Fragments while building this project.
Obviously, if you want to test the app out, you'll have to clone the project and swap out the Parse and Firebase credentials with your own. You'll also have to create some "fake" users in your Parse database as well.