The Christchurch mosque shooter, steeped in online culture, knew how to make his massacre go viral - The Washington Post

As the gunman accused of killing 49 people in attacks on two New Zealand mosques put his murderous plan into action, he had an audience. Using what appeared to be a helmet camera, the gunman live-streamed his attack, speaking to users on the hate-laden site 8chan, whom he alerted moments earlier to what was about to happen...
https://www.washingtonpost.com/technology/2019/03/15/christchurch-mosque-shooter-steeped-online-culture-knew-how-make-his-massacre-go-viral/