A way for users to log into your app using Facebook.
https://developers.facebook.com/docs/facebook-login/
Widgets · Login
Get access to data on 3,767,348 websites Facebook Login Customers. We know of 1,322,332 live websites using Facebook Login and an additional 2,445,016 sites that used Facebook Login historically and 530,693 websites in the United States.
Get a list of 3,767,348 websites using Facebook Login which includes location information, hosting data, contact details, 1,322,332 currently live websites and an additional 1,056,590 domains that redirect to sites in this list. 2,445,016 sites that used this technology previouslyand 530,693 websites in the United States currently using Facebook Login.
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