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I had a look on the facebook graph api. facebook api user object
I can’t see what the maximum length that id would be. So that I can store it my database to uniquely identify a user on my game without them needing to register or sign up.
Also is an id unique for each facebook user? – Must be.
id is pulled from JSON “https://graph.facebook.com/me?fields=id&access_token=fromiPhoneApp
A 64-bit integer is sufficient. Or if you prefer to use a character field, 20 characters. Yes, the ID is unique for each user.