https://www.washingtonpost.com/technology/2019/05/15/white-house-will-not-sign-christchurch-pact-stamp-out-online-extremism-amid-free-speech-concerns/

"Leaders from around the globe, including British Prime Minister Theresa May, Canadian Prime Minister Justin Trudeau and Jordan’s King Abdullah II, signed the “Christchurch Call,” which was unveiled at a gathering in Paris that had been organized by French President Emmanuel Macron and New Zealand Prime Minister Jacinda Ardern. Amazon, Facebook, Google, Microsoft and Twitter also signed on to the document, pledging to work more closely with one another and governments to make certain their sites do not become conduits for terrorism. Twitter CEO Jack Dorsey was among the attendees at the conference."