If you’ve ever used Facebook on your mobile phone, chances are your entire address book is on facebook.

Read the PCMag article to get more information.

Some have also reported seeing contacts listed with phone numbers on their contact lists who aren’t even their Facebook friends at all, leading them to wonder if their own contact details are populating strangers’ contact lists. (For a reminder of what you may be revealing to the world at large on Facebook if you aren’t diligent about maintaining strict privacy settings, simply visit this site.)

Here are instructions to disable this god awful feature.

Log into your Facebook account and click on “Account” at the top right hand corner, then select “Edit Friends (see picture below)

2. Click on “Contacts” on the left nav bar. (see picture)

3. Click on the link “this page” on the right side bar (see picture)

4. Click on the “Remove” button (see picture).