Facebook Live killings: Why the criticism has been harsh

Videos of two murders have been uploaded to Facebook and watched by hundreds of thousands of users over the past two weeks. Mark Zuckerberg has pledged to do more to prevent anything similar happening again, but the problem can't simply be blamed on Facebook. One of the social network's biggest responsibilities is moderating users' posts, but the sheer amount of content that's uploaded to the site every day makes this an impossible task for people alone. Facebook's mysterious algorithms cut through the noise to filter out what's acceptable and what's not acceptable, saving the site's human moderators from innocent posts and allowing them to focus on a much more manageable sample of data. Every so often, something unacceptable gets through that AI filter system.