Adding Social Sign-In to a Signup Form A/B Test

Account registration completion rate

Compare completed registrations among eligible users assigned before choosing a sign-up method.

• Repeat sign-in success rateCompare successful repeat sign-ins over the same follow-up period.
• First post-registration action rateCompare completion of the predefined first product action over the same period.
• Sign-in-related support contactsTrack requests about using a sign-in method or recovering an account.
• Email verification completion rateTrack email verification in both arms; collecting an email address does not imply consent to marketing.

• OptionAdd the predefined social sign-in provider or provider set while keeping email registration available.
• Keep constantKeep email fields, provider permissions and security steps unchanged.
• Return accessCheck whether users can identify their method and sign in again.
• AudienceIf already defined, review individual and business contexts separately.
• Separate testsTest provider count and button hierarchy separately.

1. 1Do not make social sign-in the only option or remove email registration.
2. 2Make clear what information the provider shares.
3. 3Do not add social sign-in and reduce form fields together.
4. 4Do not call a win from more registrations without checking activation.
5. 5Do not treat security checks in the identity flow as friction to be tested away.