Apple has released a new Sign in with Apple ID feature that works similar to existing social media sign-ins. I’m still reading the documentation here, https://developer.apple.com/documentation/signinwithapplejs but I wanted to share in case anyone else was interested in adding it to their website.
One thing that separates Apple ID from other social media sign-ins is their use of private email relay service, which is essentially a private email address. In order to communicate with a user that uses his private email address, the website’s domain must be registered with Apple to allow the emails to go through. https://developer.apple.com/documentation/signinwithapplejs/communicating_using_the_private_email_relay_service
While I am pretty sure the Sign in with Apple ID may not be as popular as other social media sign-ins, it still may prove interesting to offer it as another sign-in solution.