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 3,766,839 websites Facebook Login Customers. We know of 1,544,619 live websites using Facebook Login and an additional 2,222,220 sites that used Facebook Login historically and 623,377 websites in the United States.
Get a list of 3,766,839 websites using Facebook Login which includes location information, hosting data, contact details, 1,544,619 currently live websites and an additional 1,280,141 domains that redirect to sites in this list. 2,222,220 sites that used this technology previouslyand 623,377 websites in the United States currently using Facebook Login.
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