Google+ Authentication (iOS/Android)

[qberty]

I think it'd be a very useful feature to allow mobile apps on iOS and Android to be able to handle user accounts by allowing users to sign in with their google account.

It's extremely simple in Java for Android as well as ObjC for iOS:

Android: https://developers.google.com/+/mobile/android/sign-in
iOS: https://developers.google.com/+/mobile/ios/sign-in