Jorge Vergara provides a comprehensive guide on integrating Facebook Sign-In with Ionic and Firebase, highlighting the process in three distinct steps. The tutorial begins by setting up a Facebook developer account to create an app and obtain necessary credentials. It then moves to the Firebase console to enable Facebook authentication using these credentials, ensuring seamless user login through the Facebook app rather than a browser. The final step involves coding the authorization and authentication process, utilizing the Ionic Native Facebook plugin to allow users to log in and subsequently authenticate through Firebase. The guide emphasizes the importance of proper configuration to enhance user experience and offers a starter template with pre-configured Google and Facebook authentication, simplifying the integration process for developers.