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 3,423,222 websites that are Facebook Login Customers. We know of 1,926,994 live websites using Facebook Login and an additional 1,496,228 sites that used Facebook Login historically and 875,323 websites in the United States.
Get a list of 3,423,222 websites using Facebook Login which includes location information, hosting data, contact details, 1,926,994 currently live websites and an additional 1,512,503 domains that redirect to sites in this list. 1,496,228 sites that used this technology previously and 875,323 websites in the United States currently using Facebook Login.
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