If you have a phone or device, like the iPhone / Android iPad or use the Facebook application and mobile access to Facebook, then you should know that by activating the address book synchronization with Facebook contacts that automatically picks up all your numbers from your address book and loads them on your Facebook profile … and with no privacy!
To delete them must go to edit friends http://www.facebook.com/friends/ to the left and click on Contact. Alternatively, here’s the direct link: http://www.facebook.com/friends/edit/?sk=phonebook . In the right column should read this text:
“The page shows the contacts that you imported from your mobile phone and your Facebook friends. If you want to remove your phone contacts from Facebook, you must disable the feature on your phone and go to this page “
Clicking on “this page” you can remove the contacts.
It is also recommended to disable synchronization. This can be done by the settings on your Facebook Mobile on your phone.