https://www.vox.com/policy-and-politics/2019/3/17/18269617/new-zealand-shooting-mosque-online-extremism-tech

Friday’s massacre exemplified the problem of expecting tech companies to self-police content.

The hate-filled terror rampage at two mosques in Christchurch, New Zealand, was meticulously designed to maximize the number of witnesses around the globe, highlighting the difficulty in putting a lid on extremist hate that spreads online.