Twitter added the “Sign in with Apple” feature on Monday. It’s a privacy feature that lets users hide their email address from the online service. And avoid the hassle of signing in.
See also: Twitter: You will soon be able to sign up with your Google account

See also: Twitter: Very low percentage of users using 2FA
Twitter also implemented support for logging in via a Google account.
The announcement came out on Twitter, of course:
Sign in with Apple — which Twitter calls Continue with Apple — is currently available for the iOS app. It's coming "soon" to sign in via the web.
See also: Twitter Spaces: Will allow you to control the sound of your voice
How to use Sign in with Apple
When you use Sign in with Apple, you bypass the normal sign-in process for the app or website. You don't need to create a new password or even share your email, as your Apple ID and password take their place.
Once your account is set up with Apple's system, you can use Face ID or Touch ID.
You don't even have to tell Twitter (or any service) your real email. The Apple login is designed to work with Hide My Email.
Someone who has already created a Twitter account the usual way can switch to Sign in with Apple, but the original account must be set up with the same email address as their Apple ID.
Source of information: cultofmac.com
