https://techcrunch.com/2019/03/17/facebook-new-zealand/

Facebook said it removed 1.5 million videos from its site within the first 24 hours after a shooter livestreamed his attack on two New Zealand mosques, killing 50 people.

In a series of tweets, Facebook’s Mia Garlick said a total of 1.2 million videos were blocked at the point of upload. Videos that included “praise or support” from the attack were also removed, she said, using a mix of automated technologies — like audio detection — and human content moderators.