Facebook app shares ALL your Phone Numbers?

It is clear now that the "privacy problems" are not merely bugs, but actually endemic to their corporate culture. A new report shows Facebook's iPhone app can share all of the numbers in your address book in a public space or user consent. To protect yourself, simply (1) never add your phone number to your Facebook profile and (2) don't sync your iPhone/iPod Touch/iPad address book to Facebook.

The Guardian's Charles Arthur reports that Facebook's Contact Sync feature links your friends' Facebook profile pictures to the contact telephone number in your iPhone address book. The app then pushes these private phone numbers onto Facebook's servers, and publishes them to Facebook's Phonebook app. The Facebook app also appears to share numbers for contacts that you don’t have, but your Facebook friends do. If you are logged onto Facebook, you can see your Phonebook here.