I was logged into facebook and just saw the craziest thing; you can have your apps activated and doing things while you aren't signed into facebook.
I am sure you must be thinking, that doesn't make any sense.
Let me describe my steps below:
I was logged into two sessions of facebook (two windows open) and they were both on my home page.
I was using firefox and on one of the sessions went into the mafia wars game application; I then clicked on the second session and signed out of facebook. One would think that by signing out of this session, it would have deactivated my other session as well; it did this to a certain extent. I carried out a few actions in my game, ie. deposited some money etc and was able to do this successfully. I then clicked on the home link and it asked me to sign into facebook.
When I saw this, I re-signed into facebook and re-entered my application and checked to make sure the applications I had carried out in my game had been successful; they had, I was able to recreate this scenario without any problems.
This is significant, if I can do this in mafiawars, can you picture the implications with other applications? What if other applications go further and connect to things like your location, or private pictures? What if you were logged into facebook, on a public computer like in the library?
Something to think about...