If I on my app login using the facebook module, then I shut down the app. I log in to facebook using a web browser. Remove my app from my settings and then start my app again. The facebook button now shows me as logged in but when I try to execute any commands I get:
"Session key invalid or no longer valid".
IsLoggedIn still returns true and the button shows me as logged in…
You can use "Ti.Facebook.logout(callback)" if you're using the latest build. I have seen it in the code altought it's not documented