Google+ Sign-In API improved with cross platform sign-in

We're at Google I/O, where they just announced improvements to their Google+ Sign-In API, which is cross platform sign-in. What does that mean? If you find a cool website that you like (they demoed it with Fancy), you can sign in with Google+. If you do, you will automatically be asked if you would like to install the app on your Android device. If you say yes, the app will download and log you in automatically on your current device and other Android devices on your account. Very cool improvement to a good API. 

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Sean Brunett