Authenticate User using FaceBook/Google using OpenAuth

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http://blogs.msdn.com/b/webdev/archive/2012/09/12/integrate-openauth-openid-with-your-existing-asp-net-application-using-universal-providers.aspx

http://blogs.msdn.com/b/webdev/archive/2012/08/22/extra-information-from-oauth-openid-provider.aspx

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