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https://stackoverflow.com/questions/17532476/facebook-email-field-return-null-even-if-the-email-permission-is-set-and-acce
https://github.com/facebook/php-graph-sdk/issues/771
https://github.com/firebase/quickstart-android/issues/129
https://support.backendless.com/t/facebook-gender-is-always-null/9391
https://developers.facebook.com/docs/unity/reference/current/FB.LogInWithPublishPermissions/?locale=de_DE
https://books.google.de/books?id=ZGVaBgAAQBAJ&pg=PA122&lpg=PA122&dq=facebook+login+email+null
https://de-de.facebook.com/ruvnull/reviews/?ref=page_internal
https://forum.unity.com/threads/facebook-login-null-reference.499535/
https://forums.servicestack.net/t/some-facebook-oauth-users-emails-null/6641
https://books.google.de/books?id=_NAABAAAQBAJ&pg=PA552&lpg=PA552&dq=facebook+login+email+null
https://null-byte.wonderhowto.com/forum/hack-facebook-account-when-you-know-previous-password-person-0148540/
https://laracasts.com/discuss/channels/laravel/socialite-facebook-users-email-is-always-null
http://www.prmagazin.de/meinung-analyse/hintergrund/facebook-freunde-null.html