I'm making a Connect site based on your sample that also has an swf embedded in the page.
I want the swf to be able to communicate with Facebook too so I'm passing all the fb_sig values to my swf via flashVars as it would in a canvas app with a <fb:swf />.
After successfully connecting the vars are getting passed in all except:
fb_sig_ss = _facebookAPI.Session.SessionSecret;
This is always an empty string.
I've got no idea why. Any help greatly appreciated.