The second Christchurch Call was completed online last week with Jacinda Ardern chairing the meeting.
The Christchurch Call was started in 2019 by Ardern and French President Emmanuel Macron following the 2019 Mosque shootings.
The aim is to get countries and Tech companies working together to eliminate terrorist and violent extremist content online.
Ardern said good progress had been made since the call was launched. She said that “in two years we’ve done important work together, building our common capabilities to respond to crises. Build our resilience and inclusion in our own communities.”
During the meeting Macron welcomed the six new nations who had joined the call, namely the United States, Tunisia, Peru, Estonia, Czech Republic and Croatia.
It was vital that democracies come together to fight extremist content online, he said.
British Prime Minister Boris Johnson addressed the Christchurch Call, highlighting his support for the fight against extremist content online. He said that British authorities have removed more than 300,000 items of online terrorist material from the internet over the past decade.