The Christchurch Call to Action will hone its focus on people's "online journeys" and how certain platforms can steer users towards radicalisation.
The commitment was announced today after a virtual summit - chaired by Prime Minister Jacinda Ardern and French President Emmanuel Macron - to mark the Call's two-year anniversary.
Fourteen state leaders and 120 Call members participated in the summit.
Although US President Joe Biden and Facebook chief executive Mark Zuckerberg were absent, US Secretary of State Antony Blinken and Facebook's vice‑president for global affairs Nick Clegg took part.
The Call members said, in a joint statement, they would look at designing ways to better understand the "algorithmic outcomes" for the likes of Facebook and YouTube, which have the potential to lead users on a path towards increasingly more extreme and radical content.
"This will help us address the question of amplification and identify more effectiveintervention points," the statement said.
The Prime Minister’s Special Representative on Cyber and Digital, Paul Ash, told Francesca Rudkin he is encouraged by the progress in the last two years.
"I think if we look back two years ago, and were looking forward to today. We would have seen the level of support as being right out at the upper end of what we could have imagined."
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