What the Heck is Sign In with Apple?

A murb'ed feed, posted almost 5 years ago filed in oauth, facebook, twitter, apple, google, privacy, gdpr, email & authentication.

TL;DR: Basically Sign in with Apple is OAuth, same as Facebook and Twitter, but instead of returning any personal data, Sign in with Apple only returns a sub(ject) string, which is the only way to identify a user. Additional data should be explicitly added by the user within the app (Facebook and Twitter for example, provide app-developers with email address and user names). Facebook might even return waaay more.

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