Facial recognition systems trained on millions of photos of people without their consent

Facial recognition algorithms are being trained using photos of people who have not given their consent, legal experts have warned. Companies like IBM are scraping millions of publicly available images from Flickr and other sites in order to improve the technology, though the people in the photos have no idea this is happening. Civil rights activists warn that this technology could one day be used to track and spy on the same people whose faces have been used to train it. We'll tell you what's true. You can form your own view.