How do mobile apps typically manage user sessions? -

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i web developer making mobile app. have ruby on rails backend mobile client. when user signs up, needs create new user or sign in; needs fetch data user.

i don't want require them enter username , password. should seamlessly associated device/phone number/fb account/whatever.

if got right, can either use facebook api or normal logging form. make sure enable automatic logging in , user won't have enter data.


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