Larafy enables your user to login using facebook, twitter, google & github. If you need to enable this type of login you need enable 'Social Login'. You need to register an app with oAuth provider. Once you register app with oAuth provider, you get client id, client secret. You need to setup redirect URL. You can point this redirect URL to <your_app_url>/auth/<provider_name>/callback.
Sample callback URL for facebook is http://larafy.wmlab.in/auth/facebook/callback
Another very important feature that Larafy provides to user is enabling oAuth2 login by using this application.