Useful perspective on face recognition technology

Is facial recognition tech really a threat to privacy? (BBC)

Facebook has decided not to offer its photo-sharing app Moments in Europe because of regulator concerns over its facial recognition technology.

And earlier this week, talks between US tech firms and privacy campaigners broke down over fears about how the industry is planning to use the tech.

So why is there so much concern over facial recognition tech, and is it justified? We unpick some of the issues.