Accessibility Specialist at Facebook Matt King, who is blind, demonstrates how a new Facebook tool verbally describes photos to users, on Nov. 5, 2015 at the Facebook headquarters in Menlo Park, Calif. Facebook has been harnessing the power of artificial intelligence to make the site easier to navigate for the blind and visually impaired. The social media giant has been testing a new tool that describes photos to blind people. (Dai Sugano/Bay Area News Group/TNS)