Facebook for Websites - Facebook Developers: "As long as the user is signed into Facebook, they are automatically signed into your site as well. Using Facebook for login provides you with all the information you need to create a social, personalized experience from the moment the user visits your site in their browser.
Facebook Platform uses OAuth 2.0 for authentication and authorization. While you can add login to your site using OAuth 2.0 directly (see our Authentication Overview), the open source JavaScript SDK is the simplest way to use Facebook for login."
'via Blog this'
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