I just blogged this. Let me know what you think.
https://medium.com/@andytriboletti/build-ios-and-android-apps-like-tinder-for-9-13932a148201#.rjs6v6atn
https://medium.com/@andytriboletti/build-ios-and-android-apps-like-tinder-for-9-13932a148201#.rjs6v6atn