Verifying the user in a server-backed Silverlight application

Jan 8, 2010 at 7:14 PM

I have a silverlight application that can successfuly connect to facebook. The problem is that in order for a server to verify that the user is indeed logged in to facebook I need to pass to the server the signature created by facebook and verify it server-side.

But where can I find the signature? I couldn't find it In the _facebookAPI.Session nor anywhere else.