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 3,664,031 websites that are Facebook Login Customers. We know of 506,891 live websites using Facebook Login and an additional 3,157,140 sites that used Facebook Login historically and 213,438 websites in the United States.
Get a list of 3,664,031 websites using Facebook Login which includes location information, hosting data, contact details, 506,891 currently live websites and an additional 516,237 domains that redirect to sites in this list. 3,157,140 sites that used this technology previouslyand 213,438 websites in the United States currently using Facebook Login.
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