Luke Shepard, Facebook Platform engineer who helped author OAuth 2.0, dives into the spec and FB implementation - http://www.sociallipstick.com/...
The FB docs don't have info on the client credentials flow - I was trying to 'divine' it from the OAuth spec, but I couldn't get it to work. Can we get the individual flows outlined in the docs? - Justin Hart
Justin - it's technically outlined at the bottom here: http://developers.facebook.com/docs... - Luke Shepard
But I agree we can make it more clear. - Luke Shepard