A few days ago I reported here on how Facebook can acquire your phone numbers through friends synchronizing their iPhone contacts with Facebook, probably while at a state of complete ignorance as to what the potential consequences of their seemingly innocent action may be.
Today it started: for the first time ever, my wife received junk SMS from the UK to her work mobile phone during the night. Facebook seems the main plausible source for them acquiring the phone number from.
I have already deleted my Facebook profile. Do you like your privacy or are you willing to take your chances with Facebook?