https://www.cnbc.com/2019/03/21/why-facebooks-ai-didnt-detect-the-new-zealand-mosque-shooting-video.html > Facebook explained why its artificial intelligence tools failed to detect the video of the New Zealand mosque shooting live streamed on its site last week before being viewed 4,000 times. A suspected gunman killed 50 people in an attack on two mosques in the area. > The video was removed by Facebook after being flagged for the first time by a user 29 minutes after the stream began, the company said in a blog post Wednesday night. Several social media platforms removed the original video from their sites, but quickly saw copies pop up at a clip with which their moderation systems couldn't keep up. Users also altered the video to slow down automatic detection.