Facebook Android SDK login
Facebook Android SDK API provides single sign on (SSO), that means if has logged through Facebook app session, so you needn't sign in Facebook every time.
It will pop-up Facebook sign in dialog every time, but it may disturb users and they could not like this way.
http://stackoverflow.com/questions/8795985/how-logout-works-in-facebook-sdk-android
http://stackoverflow.com/questions/7679875/is-there-a-way-to-log-out-via-facebook-api-on-android-if-you-have-the-facebook-a
_fbAPI.authorize(this, new String[] { "email" }, Facebook.FORCE_DIALOG_AUTH, new DialogListener() );
It will pop-up Facebook sign in dialog every time, but it may disturb users and they could not like this way.
http://stackoverflow.com/questions/8795985/how-logout-works-in-facebook-sdk-android
http://stackoverflow.com/questions/7679875/is-there-a-way-to-log-out-via-facebook-api-on-android-if-you-have-the-facebook-a
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