On March 15 last year, a gunman armed with two semi-automatic weapons killed 51 people at two mosques in Christchurch and live streamed his attack on social media.
The video of the attacks was viewed 4,000 times before being removed from Facebook.
Australian man Brenton Tarrant has pleaded not guilty to 51 counts of murders, 40 charges of attempted murder, as well as engaging in a terrorist act.
Two months after the massacre, the New Zealand Prime Minister Jacinda Ardern co-chaired a summit in Paris with French President Emmanuel Macron which became known as the Christchurch Call.
Its aim was to bring government and tech companies together to eliminate terrorist and violent extremist content online.