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 3,696,768 websites that are Facebook Login Customers. We know of 478,084 live websites using Facebook Login and an additional 3,218,684 sites that used Facebook Login historically and 207,479 websites in the United States.
Get a list of 3,696,768 websites using Facebook Login which includes location information, hosting data, contact details, 478,084 currently live websites and an additional 524,920 domains that redirect to sites in this list. 3,218,684 sites that used this technology previouslyand 207,479 websites in the United States currently using Facebook Login.
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