According to authorities, a shooter appeared to livestream video of the attack on Facebook, documenting the attack on Facebook from the drive to the Al Noor Mosque from a first-person perspective, and it showed the shooter walking into the mosque from the auto and opening fire.
"We're also removing any praise or support for the crime and the shooter or shooters as soon as we're aware", Facebook said. A spokeswoman for Facebook New Zealand, Mia Garlick, said that such videos were quickly taken down. "Please know we are working vigilantly to remove any violent footage", YouTube said in a tweet. "There were three in the hallway, at the door leading into the mosque, and people inside the mosque", he said.
"While Google, YouTube, Facebook and Twitter all say that they're cooperating and acting in the best interest of citizens to remove this content, they're actually not because they're allowing these videos to reappear all the time", Lucinda Creighton, a senior adviser at the Counter Extremism Project, an worldwide policy organization told CNN.
New Zealand's Department of Internal Affairs said people posting the video online risked breaking the law.
Facebook yesterday acknowledged the challenge and said it was responding to new user reports.
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.
Because it's 2019, and livestreaming has had five years or so to really build up into a mainstream activity that people actually do, this means that horrific acts of violence and terror around the world have a greater-than-zero chance of having some video component attached to them. In another case, the video was shared by a verified Instagram user in Indonesia with more than 1.6 million followers.
Once a video is posted online, people who want to spread the material race to action.
PewDiePie, whose real name is Felix Kjellberg, said on Twitter he felt "absolutely sickened" that the alleged gunman referred to him during the livestream.
In 2017, a father in Thailand broadcast himself killing his daughter on Facebook Live.
As the New Zealand massacre video continued to spread, former New Zealand Prime Minister Helen Clark in televised remarks said social media platforms had been slow to close down hate speech.
The rampage's broadcast "highlights the urgent need for media platforms such as Facebook and Twitter to use more artificial intelligence as well as security teams to spot these events before it's too late", Ives said. That year, a video of a man shooting and killing another in Cleveland also shocked viewers.
Joshua Buxbaum, chief executive of Irvine, California-based moderation technology company WebPurify, said Facebook and other services could employ image recognition or other types of AI to identify copies in additional ways.