Facebook and Standard Codeigniter Login

[eluser]Demilium[/eluser]
What I did, was request the users email as a permission when they're logging in with the Facebook SDK. Then I checked to see if the user had already registered by checking the Facebook e-mail against the rows in the database -- and if so update the row with the fb_uid, etc. Also, I stored the access_token (but an extended one, since the 'offline_access' permission has been depreciated).

Hope this helps.