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Facebook Sign In for Firebase UI Auth
Add dependencies
flutter pub add firebase_ui_auth
flutter pub add firebase_ui_oauth_facebook
flutter pub global activate flutterfire_cli
flutterfire configure
Enable Facebook provider on firebase console.
dart pub global activate flutterfire_cli
export PATH="$PATH":"$HOME/.pub-cache/bin"
curl -sL https://firebase.tools | bash
firebase login
flutterfire configure