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https://stackoverflow.com/questions/32950937/fbsdkaccesstoken-currentaccesstoken-nil-after-quitting-app
https://github.com/facebook/facebook-sdk-swift/issues/30
https://developers.facebook.com/docs/reference/ios/current/class/FBSDKAccessToken/?locale=de_DE
https://code.i-harness.com/en/q/1f6ca99
http://hoangtran.me/ios/development/2016/08/14/login-with-facebook-in-ios/
https://www.oodlestechnologies.com/blogs/How-To-Integrate-Facebook-iOS-Application-In-swift-4
http://swiftdeveloperblog.com/code-examples/fetch-facebook-user-profile-details-in-swift/
http://ashishkakkad.com/tag/fbsdkaccesstoken/
https://firebase.google.com/docs/auth/ios/facebook-login
https://docs.microsoft.com/de-de/azure/app-service-mobile/app-service-mobile-ios-how-to-use-client-library
https://www.simplifiedios.net/facebook-login-swift-3-tutorial/
https://selise.ch/swift-tutorial-build-a-facebook-album-browser-part-2/
https://im-coder.com/ios-ueberpruefen-sie-ob-der-benutzer-bereits-angemeldet-ist-in-die-mit-facebook.html