Privacy Fail: How Facebook Steals Your Friends Phone Numbers | Kurt von Moos.com. Ouch. Facebook sends the iPhone address book to their servers and stores all contacts there when you activate the function "sync profile pictures with address book" - according to the description of the function, the user believes that only the pictures from Facebook are added to the contacts they have locally, but in reality the entire address book is facebookized. Without the user being aware at that moment what is happening.