I'm quite willing to accept giving the user informed consent to share contacts, for obvious purposes.
But the ... sheer idea that any of the following options are sensible baffles me:
a) My IT manager has permission to default my business and facebook contacts syncing up (could theoretically result in Outlook being used to spy on LinkedIn recruitment activity). Or giving my IT manager backdoor admin to my FB contacts list? Or in more serious legal territory: insight to sexual/health/unionised behaviour
b) My IT manager wants my business email contacts shipped to Facebook for any reason whatsoever