People leaving floral tributes at the Kilbirnie mosque under the guard of armed police a day after the Christchurch mosque attacks.
And though Facebook, Instagram and Twitter have all removed Tarrant's accounts, dozens of archived versions remain available, along with the links and videos he shared.
Ms Mia Garlick, a spokesman for Facebook in New Zealand, said: "We will continue working directly with the New Zealand police as their response and investigation continue".
Granted, waters had been tested in the past, like what happened in Moneta, Virginia, when a shooter killed his victims on live TV and uploaded videos of his acts online.
"Our hearts are broken over today's bad tragedy in New Zealand", the video portal said in a Twitter posting.
Live-streaming services have become a central component of social media companies' growth strategy in recent years, but they are also increasingly exploited by some users to livestream offensive and violent content.
The Facebook Live video was taken with a camera that appeared to be mounted on the gunman's body.
"There is no fool-proof way to catch acts of violence on video or images with the technology that we have today", she said. "Platforms can't prevent that, but much more can be done by platforms to prevent such content from gaining a foothold and spreading".
The app is usually used to share videos of extreme sports and live music, but on Friday the footage recreated the carnage of a computer game, showing the attacker's first-person view as he drove to one mosque, entered it and began shooting randomly at people inside.
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New Zealand mosque shooting: 'pray for God's peace'
It has been rebuilding since an natural disaster in 2011 killed 185 people and destroyed many downtown buildings. Australian PM Scott Morrison confirmed that one of the men arrested in New Zealand is an Australian citizen.
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She said she has previously met Facebook Chief Operating Officer Sheryl Sandberg, who sent her a message of condolences after the attacks.
"So I think there are some very real discussions that have to be had about how these facilities and capabilities as they exist on social media, can continue to be offered".
"The responsibility for content of the stream lies completely and exclusively on the person who initiated the stream". More than 200 people were injured.
"The content of the video is disturbing and will be harmful for people to see", the department said.
"The Government has made the determination that all shares of the video including by media organisations that might be edited to not show the graphic content is now objectionable".
AirAsia Group Chief Executive Officer Tony Fernandes closed his Facebook account and said he may shut his Twitter page, citing "hate" being transmitted on the networks.
Mouat said he believed New Zealand's businesses had a role to play in encouraging change.
Despite taking swift action, stopping the spread of unverified content may prove to be a tough challenge for Facebook and YouTube. Children's screams could be heard in the distance as he strode to his auto to get another rifle, then returned to the mosque, where at least two dozen people could be seen lying in pools of blood.