What is Facebook doing with your phone number? Two-factors authentication, or 2FA, is a security feature that helps protect your Facebook account in addition to your password. Alarmingly, recent reports say that the phone numbers provided by users for the express purpose of 2FA are now made searchable across the platform by default. Privacy International has written Facebook asking if these reports are true, whether this is a policy, and what are they doing to fix the problem. Read our letter an