TechCrunch:

From a security perspective, Apple offers a better option for both users and developers alike compared with other social login systems which, in the past, have been afflicted by massive security and privacy breaches.

Apple’s system also ships with features that benefit iOS app developers — like built-in two-factor authentication support, anti-fraud detection and the ability to offer a one-touch, frictionless means of entry into their app, among other things.

For consumers, they get the same fast sign-up and login as with other services, but with the knowledge that the apps aren’t sharing their information with an entity they don’t trust.

This new feature seems to be causing a lot of confusion but there’s some good information here for both developers and users to help lift the cloud.