WebSite Enabling Facebook Login
This Tip Shows You Visually and Step-by-step How-to Enable Facebook Login for a Web Site Domain.
To Enable Facebook Login is Necessary to Set the Callback URL, nothing other that the Web Site Domain/SubDomain.

-
First Enable or Login into the Facebook Developers
-
Choose or Add New App
-
Click on Choose Platform Button
-
Select WebSite
-
Set the WebSite’s URL
-
Push the Next Button
And it’s Done ;)