JavaScript SDK - Facebook Developers: "Authentication & Authorization
The Facebook JavaScript SDK allows your users to register and sign-in to your site using their Facebook accounts. This is done by sharing the logged in user state between https://www.facebook.com/ and your site. A Facebook user remains logged in to your site as long as they are logged in to Facebook and there is a valid access token for your app.
This means you do not need to create your own registration flow and your user's do not have to create new profiles or remember a new username. Best of all, you also get to access the user's social graph -- allowing you to create a great customized, social experience as well as the ability to publish user actions back to Facebook."
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