Evolving AI on Instagram: "China has built one of the largest surveillance systems in the world. In 2017, it had over 170 million CCTV cameras. Today, estimates suggest there are more than 700 million. Many are connected to facial recognition systems that match faces to national ID records in real time. To demonstrate its capabilities, a BBC reporter took part in a test in the city of Guiyang in 2017. His photo was added to the system, and police located him in just seven minutes using live came