What credit cards allow you to add an Authorized User WITHOUT requiring their social security number?

Both personal and small business credit cards would be helpful. Thanks!
I know through personal experience that American Express DOES require a SS# when adding additional cardholders (at least for personal cards), and that Advanta does NOT require a SS# when adding additional cardholders.

Personal experience with additional issuers would be helpful.
Please provide specific credit card issuers. Thanks!