Do you, your friends or family have a facebook account?? Then it's possible your home, cell, work and other telephone numbers are listed on Facebook?
Yes that's right - If you or your friends or family, has a friend on Facebook that posts or reads posts on Facebook using their iPhone app (on any smartphone) to access Facebook, then it ‘s more than likely that your private phone numbers (home, work, cell and any others they have noted in their contact list) and those for everyone else in their contact list that has a Facebook accounts - will all be matched up and listed on Facebook!
How & Why?? Because Facebook's "Contact Sync" feature, which synchronises friends' Facebook profile pictures with the contacts in their phone. So it imports/uploads all the names and phone numbers you have on your (smart)phone, uploads them to Facebook's Phonebook app and then matches them up with all users on your account and so on & so forth...the implications are overwhelming on our personal information being shared..
Be sure to check your friends & change your Privacy Settings:: When you are on your Facebook Account, go to the top right corner of your screen, click Account, then Edit Friends. Go to the left side of your screen and click phonebook. Everyone's phone numbers are now being published.
Let friends and family know this, so telephone numbers can be removed.
To change privacy settings: go to Privacy settings, then to phone, then to customize and choose "only me"
Remember - options change in your privacy settings, so check them often to be sure of what is and isn't activated...