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Parameters Passed to Facebook Application

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  1. Facebook passes the following parameters to your application when a user interacts with your application:
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  3.     * fb_sig_added: If set to true, then the user has authorized your application.
  4.     * fb_sig_api_key: Your application's API key.
  5.     * fb_sig_friends: The UIDs of the visiting user's friends.
  6.     * fb_sig_locale: The user's locale.
  7.     * fb_sig_time: The current time, which is a UNIX timestamp.
  8.     * fb_sig_user/fb_sig_canvas_user: The visiting user's ID. fb_sig_canvas_user is passed if user has not authorized your application, while fb_sig_user is passed if the user has authorized your application. Neither is passed when an application tab is being requested; fb_sig_profile_user is passed instead.

URL: http://wiki.developers.facebook.com/index.php/Authorizing_Applications#Parameters_Passed_to_Your_Application

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