i am using appWarp j2me sdk ansd app42 plateform.
i have asked you same question but it is misunderstand by you.
multiple users are not loged in on the same devoice simultaniously.
in the begining while we resently install the game , only one user ligin the facebook on a device it will work well.
next time same user login the facebook then he will get message
Your Access Code has been saved with us. Please close your browser and
go back to your app for accessing facebook social.
its ok.
but if same user want to login facebook with another user name then he could not do that. because the message is diplayed in place of displaying facebook login page.