AI Isn't Smart Enough (Yet) to Spot Horrific Facebook Videos

When Steve Stephens uploaded a 57-second video to Facebook of himself shooting and killing a man Sunday, the video stayed on Stephens' Facebook page for more than 2 hours before the company finally pulled it down. It was enough time for thousands of people to watch and share it on Facebook, and for third-party websites to download and reupload the video to their own servers. The incident reignited a fierce, if familiar, debate about what social media companies can do to keep gruesome content off of their sites and how these companies should go about removing offensive material. The murder also reminded us that once something hits the internet and gets shared around, it's incredibly difficult to scrub it from every corner of the web. So how much should companies do to prevent that content from appearing at all?