An anonymous reader writes: In early January, Facebook updated their iPhone app to include a Contact Sync feature. In a nutshell, “Facebook Contact Sync” allows you to synchronize your friends’ latest Facebook profile pictures with the matching contact entry in your mobile phone’s address book. Due to “Terms of Service Issues” however, Facebook does not sync your friends email addresses or phone numbers (listed on their Facebook profile) TO your phone.
Ironically, what Facebook WILL DO, with neither your knowledge or consent, is import ALL the names and phone numbers FROM your phone’s address book and upload them to your Facebook Phonebook app on Facebook.com, thus storing your private contact numbers on Facebook’s servers. Once your phone is synced , Facebook will attempt to match the newly uploaded phone numbers to users that have listed the same phone number on their Facebook profile, wether you are friends with them or not. If Facebook cannot make a match, it will create a new contact entry in your Facebook Phonebook using the contact details imported from your phone, and add a link to invite them to join Facebook. And guess what? There is no way to delete the names and numbers Facebook imports from your phone’s address book.