Facebook JavaScript SDK - Facebook login

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Facebook login using Facebook JavaScript SDK: How is it working under the hood? How is my application (running on mydomain.com) able to get user details from another domain (facebook.com). I was under the impression that the OAuth2 login always needs a redirect to the app server. Is it using implicit flow? even implicit flow needs a redirect to the app server, isn't it? Or is it not using OAuth2 at all?

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