Facebook Login Setting
Login to Admin->Site Settings->Settings.
Here, you will be enable login with Facebook.
How to Setup Facebook Social Login and What is Facebook Social Login Callback URL?
Setup Facebook Social Login: https://docs.ultimatemember.com/article/20-social-login-facebook-app-setup
Callback URL:
if your domain is like that https://yourdomain.com/ then the callback URL is https://yourdomain.com/auth/facebook/callback
and
if your domain contents public like that https://yourdomain.com/public then the callback URL is
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