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https://developers.facebook.com/docs/facebook-login/multiple-providers/
https://developers.facebook.com/docs/facebook-login/web/login-button/
https://developers.facebook.com/docs/facebook-login/ios/advanced/
https://stackoverflow.com/questions/9810335/how-to-change-facebook-login-button-with-my-custom-image
https://stackoverflow.com/questions/11841725/how-to-add-facebook-login-to-my-own-website/21112326
https://www.socialmediaexaminer.com/how-to-use-facebook-login-on-your-website/
https://wordpress.stackexchange.com/questions/141624/custom-connect-to-facebook-problem-logging-in-logging-out
https://www.youtube.com/watch?v=Tl_uCGjCZd8
https://auth0.com/docs/connections/social/facebook
https://support.knack.com/hc/en-us/articles/231796207-Single-Sign-On-with-Google-Facebook-Twitter-and-Custom
https://www.letsbuildthatapp.com/course_video?id=422
https://medium.com/mindorks/facebook-login-in-android-app-160cdf6aa08c
https://adespresso.com/guides/facebook-ads-beginner/facebook-manager-campaign-setup/