"Not long after a man gunned down dozens and killed at least 50 worshipers inside two New Zealand mosques while wearing a body-mounted camera to record the carnage, the video quickly spread on YouTube — it was repeatedly taken down and then posted again, with uploaders able to work around the video platform's artificial intelligence detection tools. Experts on online radicalization and terrorist content said that social media companies like Facebook, Twitter and Google must do more to combat it. 'Reports say Facebook needed 17 minutes to remove the livestream. ... The technology to prevent this is available. Social media firms have made a decision not to invest in adopting it,' Counter Extremism Project Director David Ibsen said in a statement."