in fbc/facebook.php find
public static $DOMAIN_MAP = array(
'api' => 'https://api.facebook.com/',
'api_read' => 'https://api-read.facebook.com/',
'graph' => 'https://graph.facebook.com/',
'www' => 'https://www.facebook.com/',
);
and replace with
public static $DOMAIN_MAP = array(
'api' => 'https://api.facebook.com/',
'api_read' => 'https://api.facebook.com/',
'graph' => 'https://graph.facebook.com/',
'www' => 'https://www.facebook.com/',
);