Facebook says none of the 200 or so people who watched live video of the New Zealand mosque shooting flagged it to moderators, underlining the challenge tech companies face in policing violent or disturbing content in real time.
The social media giant released new details about its response to the video in a blog post. It said the gunman's live 17-minute broadcast was viewed fewer than 200 times and the first user report didn't come in until 12 minutes after it ended. Fifty people were killed at two mosques in Christchurch.
Facebook removed the video "within minutes'" of being notified by police, said Chris Sonderby, Facebook's deputy general counsel.
"No users reported the video during the live broadcast," and it was watched about 4,000 times in total before being taken down, Sonderby said. "We continue to work around the clock to prevent this content from appearing on our site, using a combination of technology and people."