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One good reason: If Facebook goes broke, or decides to stop offering their authentication service, or anything like that, your user database is now filled with
by thristian 14y ago
One good reason: If Facebook goes broke, or decides to stop offering their authentication service, or anything like that, your user database is now filled with useless Facebook user IDs. If Mozilla's Persona system goes broke or gets taken offline, your user database is now filled with perfectly good, validated email addresses, so you can still contact your users and/or match up new registrations with existing accounts.
- immad 14y agoIf you ask for the permission Facebook will give you the users email address. You can additionally just ask for the users email address. Any one building a serious business using facebook auth does one of the above.
- tg3 14y agoIIRC email is one of the few pieces of information about users that you get by default, and cannot be revoked by the user (without revoking the app entirely)
- patja 14y agoIncorrect. You must request and obtain the extended permission 'email' in order to retrieve the user's email address from Facebook.
- JBiserkov 14y ago>If you ask for the permission Facebook will give you the users email address. us3r-1D@facebook.com - that's helpful :)