Madhumita Murgia: From Facebook to face-recognition: The business of biometrics

Madhumita Murgia chronicles the rising use of biological data - from faces to voices and DNA - by companies whose products we use every single day. By giving away this sensitive data for free, we open ourselves up to potential crimes, discrimination and even mass surveillance. She wants each one of us - anyone who uses the internet - to stand up and demand biometric rights, before it's too late.