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If 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.

>If you ask for the permission Facebook will give you the users email address.

us3r-1D@facebook.com - that's helpful :)

IIRC 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)

Incorrect. You must request and obtain the extended permission 'email' in order to retrieve the user's email address from Facebook.

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