Using the Facebook authentication source with simpleSAMLphp
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Remember to configure `authsources.php`, with both API key and secret.

To get an API key and a secret, register the application at:

 * <http://www.facebook.com/developers/>

Set the callback URL to be:

 * `http://idp.example.org/simplesaml/module.php/authfacebook/linkback.php?next=`

Replace `idp.example.org` with your hostname.