Ralph,
It does work on Android, but facebook (not us) has an outstanding bug where deep linking won’t work unless you set up the “Mobile Web URL” on your facebook developer page. Have a look at my posting here for more details…
http://forums.coronalabs.com/topic/24607-applicationopen-event-not-firing/?p=153929
That link above also provides a Lua code snippet to print everything that is in your launch arguments and application open event. It’ll show you everything that is within the Android “Intent” object that the facebook app is sending to your app.