In São Paulo, ‘Big Brother’ is watching, with 25,000 cameras and facial recognition technology

Smile, you are being protected.

Realistically, there's going to be no way to stop this. It's too useful. It works and most people appreciate it. I know this because I have visited southern China recently. I've seen the train stations and coffee shops where people now think nothing of leaving their belongings completely unattended. This level of surveillance effectively makes petty crime impossible. It's widely seen as progress, in a way it is progress, and there's no going back.

The challenge remaining is to keep some level of democratic accountability over our governments. That's feasible but it's not going to be easy.