"Underscored by the horrific terror attacks in Christchurch, New Zealand on March 15, we agree with the overarching message of the Christchurch Call for Action, and we thank Prime Minister Ardern and President Macron for organising this important effort", the White House statement said.
Facebook said in a statement today it was introducing a "one-strike" policy for use of Facebook Live, temporarily restricting access for people who have faced disciplinary action for breaking the company's most serious rules anywhere on its site.
The Prime Minister has arrived in Paris ahead of the Christchurch Call summit overnight on Wednesday and she's not ruling out a late appearance from the United States.
"New Zealand's Muslim community be attacked in that way, the only answer was to do everything we could to prevent it from ever happening again", Ardern said.
It will also put US$7.5 million towards research partnerships to improve its image and video analysis technology that failed to block every upload of the gunman's video footage to its platform.
After much speculation, Facebook has imposed restrictions on live-streaming following the New Zealand attacks in March.
"New technology to prevent the easy spread of terrorist content will be a major contributor to making social media safer for users, and stopping the unintentional viewing of extremist content like so many people in New Zealand did after the attack, including myself, when it auto played in Facebook feeds".
In a blog post, Facebook said that anyone who breaks its rules will be restricted from using its "Live" feature.
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Dorris is aware of the social media videos and hopes witnesses will come forward to help investigators with the case. Dorris has said that in addition to this bystander video, there is likely also video from the officer's bodycam .
It is unknown what other companies will take part in the Christchurch Call, or if the voluntary agreement will help the mainstream tech companies avoid government regulation.
Beyond Facebook, the Global Internet Forum to Counter Terrorism - a trade group formed by Facebook, Microsoft, Twitter and YouTube - has said more than 800 visually distinct videos of the attack have been "fingerprinted" for its automatic ban list.
Firms themselves will be urged to come up with concrete measures, the source said, for example by reserving live broadcasting to social media accounts whose owners have been identified.
However, to the disappointment of some, a notable absentee will be Facebook chief Mark Zuckerberg, who held talks in Paris with Macron last week. "To be honest, I do not understand the United States", she said.
Under the First Amendment, American law protects a broader and more robust concept of free speech than the law in most other countries.
Knott said the United States should be involved in the effort, and anxious that its refusal to engage could undermine an issue of global importance - particularly because virtually all of the major social-media companies are based there.
Rosen explained that Facebook has historically banned rule-breaking users from its entire platform, but that its new policy seeks to set rules that would specifically bar people from the Live service.