Based on http://developers.facebook.com/roadmap/offline-access-removal/ Exception (Section) 3: If I use the "newer" SDK, it'll save the access token for me and will extend it automatically.
My questions:
[1] When it says "newer" SDK - does anyone knows whether this is referring to 3.0?
[2] Is there a way to manually assign FBSession an access token? FBSession's accessToken property is read-only. My situation: in my app user logs in using their email address, and on my server the email address is linked to a facebook access token. Now if user logs in to my app in another device, my server will return FB access token in auth response; I would like FBSession to be assigned this same access token so they don't have to reauthenticate FB and hope the access token extending process is just happening magically.
Pretty sure you don't have to worry about anymore. Looking at the code, FBSession takes care of extending the token & expiry date.
https://github.com/facebook/facebook-ios-sdk/blob/master/src/FBSession.m
来源：https://stackoverflow.com/questions/11623047/fb-sdk-3-0-do-i-need-to-extend-access-token-or-is-it-automatic