Facebook ID numbers raise valid privacy concerns. Although they do not directly reveal personal information, they can be used in conjunction with other data to gain insights into user behavior. Users ...

If you have an old phone number linked to your Facebook account, delete it. Anyone who comes into possession of that number can log into your account sans password, and you won't get so much as a ...

Every Facebook user has a unique ID number. This number gives you some information on approximately -- but not precisely -- when you and your friends joined Facebook relative to each other. A lower ...

If you use two-factor authentication (2FA) to secure your Facebook account, you likely, at some point, gave Facebook your phone number. 2FA adds an almost impenetrable layer of security to your ...

Facebook allows you to list several types of contact information on your profile page, such as your address, email and and instant-messenger screen name. You also have the option of including your ...

Users are complaining that the phone number Facebook hassled them to use to secure their account with two-factor authentication has also been associated with their user profile — which anyone can use ...

Facebook is facing criticism for not allowing users to opt out of a feature that lets people look them up using their phone number or email address. This includes users who only added their phone ...