Microsoft is collaborating with Facebook to bring system-level Facebook login capabilities to Windows 8 and Windows Phone 8. It'll be now possible for developers to build apps that allow users to log in using the Facebook credentials on their device at the touch of a button.
With Facebook Login, developers can enable consumers to:
· Login to an app with a single click or tap, re-using the Facebook credentials stored on the device.
· Share high scores and other app events to Facebook.
· Engage in social interactions like playing games against friends or finding new opponents.
· Easily access and share photos within the context of an app.