I've been able to disable all the meta boxes for non admin in their backend but I'm having problems with Facebook AWD All in one which creates a widget seen by all the users when they create new posts. How can I disable it? Is there some sort of command that is good for any widget created by plugins that I can add in my functions.php if I know the shortcode of the plugin? I need your help! Thanks...

http://wordpress.org/extend/plugins/facebook-awd/