Got a note in from reader Paul who is rather concerned by his discovery:
I don’t know if you are user of the Facebook iPhone app, but mine seems to have silently uploaded by address book into Facebook.
Try going to Account->Edit Friends. You can then see a phonebook icon on the left hand side. I clicked on it and found that it had all uploaded all my numbers!
Plus the page to supposedly remove them doesn’t work AND the sync feature is turned off in the app!
Could it be that every one of your friends has filled in their phone number on their profile, Paul?
Can anyone shed some light on Paul’s issue?