“Facebook, YouTube and Twitter are struggling to halt the spread of horrific footage that appears to show a massacre at a mosque in New Zealand as it was taking place. One of the shooters appears to have livestreamed the attack on Facebook (FB). The disturbing video, which has not been verified by CNN, purportedly shows a gunman walking into a mosque and opening fire. Hours after the attack, however, copies of the gruesome video continued to appear on Facebook, YouTube and Twitter, raising new questions about the companies' ability to manage harmful content on their platforms. '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,' said Lucinda Creighton, a senior adviser at the Counter Extremism Project, an international policy organization.”