get facebook userid of unauthorized user - new data permissions

Jun 15, 2010 at 10:06 AM

I have an existing iframe app and when I enable the new data permissions I am no longer able to get the current users facebook id through the fb_sig_canvas_user parameter. Is there any other way to get the current user's facebook id (who hasn't authorized the app)? And any ideas why fb_sig_canvas_user is no longer sent under the new permissions?