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New Zealand Prime Minister Jacinda Ardern said on Saturday that world leaders and tech firms looking to stamp out violent extremism online would need to focus efforts on understanding social media algorithms that drive content, Reuters reported.

Ardern was speaking at a virtual summit to mark the second anniversary of the global initiative to end online hate, called the Christchurch Call, launched by Ardern and French President Emmanuel Macron in 2019 after a white supremacist killed 51 people at two mosques in the New Zealand city of Christchurch while live-streaming his rampage on Facebook.

Since then more than 50 countries, international organisations and tech firms have supported the initiative including firms like Facebook, Google, Twitter and Microsoft.

"The existence of algorithms themselves is not necessarily the problem, it's whether or not they are ethically used. That is one of the biggest focus for the community over the next year alongside expanding the network itself," Ardern said a news conference after the forum.

Ardern said major tech firms expressed a real desire at the forum to use algorithms for positive interventions. She, however, did not elaborate on how firms would change the use of algorithms that drive harmful content and lead to radicalisation.

The Christchurch Call was joined for the first time by the United States, which made a policy change two years after the administration of former president Donald Trump declined to participate citing concerns of free speech. 

The event was attended by global leaders including Macron, and British Prime Minister Boris Johnson.