Oauth callback url

Hello

I need the oauth callback URLs for Facebook and twitter?

Kind regards

Facebook: mydomain/auth/facebook
Twitter : mydomain/auth/twitter

Thank you BinhQuang

It might be useful to know the same URL for Github is mydomain/auth/github

Why everything is right all the same if I fill up the blank of Github oauth callback url with the installation url ? (eg https://yourfalrum.com/)