Authorizing Applications, share button

Authorizing_Applications
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Once a user has authorized your application, you can utilize the following URLs, which you specify in your application's settings in the Developer application:

* Post-Authorize Callback URL: Facebook pings this URL when a user authorizes your application for the first time. You can also call users.isAppUser to determine if the user has authorized your application.
* Post-Authorize Redirect URL: You can redirect a user to this URL after the user authorizes your application for the first time. You can use this URL only if the user authorizes your application through login.php and not the login dialog.
* Post-Remove Callback URL: Facebook pings the URL when a user removes your application.


For FBML canvas page applications, the parameters are sent as POST parameter. For iframe applications, the parameters are sent as GET parameters, unless you are preloading FQL using the fb_iframe_post option, in which case the parameters are sent as POST parameters.