A new single sign-on implementation called "Sign in with Apple" allows users to create accounts with third-party services with a minimal amount of information. Users can share emails or a private "relay" email with the app.[27] Users may generate a disposable email address for each site, improving privacy and anonymity, and reducing the amount of information that can be associated with a single email address. All iOS applications that support third-party login methods, such as Facebook and Google, must support the "Sign in with Apple" system, and the iOS human interface guidelines recommend that developers place the "Sign in with Apple" option above other login methods.