Livestreaming terrorist attacks. Using social media to spread deadly ideas. Manipulating banned videos to keep sharing them online.

World leaders and tech bosses are meeting Wednesday in Paris to find ways to stop all this. They're working all day on the “Christchurch Appeal,” named after the New Zealand city where 51 people were killed in a March attack on mosques.

The attacker streamed the killing live on Facebook, which announced tougher livestreaming policies on the eve of the meetings “to limit our services from being used to cause harm or spread hate.”

Read more: Los Angeles Times