Did you know that if you enter someone’s phone number or email address into the search box on Facebook, the site can perform a reverse look-up and tell you who the information belongs to?
If you want to change your settings to make your phone number and email more private, the solution is to change your privacy settings under a section called “How you connect.” The default chosen by Facebook for “Who can look you up using the email address or phone number you provided?” is “Everybody.”
To limit those who can perform a reverse look-up against your phone number and email, you have the option to change the setting to “Friends of friends” or “Friends only.”
According to Facebook, the ability to search for a person by phone number is intentional behavior and not a bug in Facebook. By default, your privacy settings allow everyone to find you with search and friend finder using the contact info you have provided, such as your email address and phone number. You can modify these settings at any time from the Privacy Settings page.
BBB warns consumers to be cautious of how much personal information is shared on social media sites and made public to “Everybody.”