What I don't like is the fact that despite a complete lack of a Facebook profile, Facebook still has got my biometric data because I have several friends that use the service and I am often in photographs that get uploaded. Zuckerberg et al might not specifically know who I am beyond whatever primary key they assigned my facial data in their database, but they'll be able to identify me as such in any other photographs or videos and I have no idea if any of the existing privacy laws or regulations would even cover the use of such non-subscriber data.
Maybe I'm paranoid but for some reason I just don't trust multi-billion dollar corporations to act in my best interests.