"Facebook said it 'quickly' removed a live video from the suspected gunman in twin mosque shootings in Christchurch that killed at least 49 people. But the livestream lasting some 17 minutes, according to some reports, was shared repeatedly on YouTube and Twitter, with some footage still being viewed early Friday. The major internet platforms have pledged to crack down on sharing of violent images and other inappropriate content through automated systems and human monitoring, but critics say it isn't working. 'There's no excuse for the content from that livestream to be still circulating on social media now,' said Lucinda Creighton, a former government minister in Ireland and an advisor to the Counter Extremism Project, which campaigns to remove violent internet content. The online platforms 'say they have their own technologies but we don't know what that is, there is no transparency, and it's obviously not working,' she added. The organization has developed technology that would flag certain kinds of violent content and offered it to internet firms, but has been rebuffed."