The spectre of ISIS-linked material on YouTube has been revealed by a high-tech research project that has tracked the terror group's uploads to the channel. The US-based Counter Extremism Project (CEP) found that in a three-month period this year 1,348 videos were uploaded to the platform, garnering 163,391 views. Despite tech giants' pledges to clamp down on such content, 24 per cent of the videos remained online for more than two hours, receiving 148,590 views, according to the research. CEP senior advisor Lucinda Creighton referred to the case of ISIS cyber-hacker Junaid Hussain, who left his home in Birmingham to become a recruiting sergeant and propagandist for the terror group, as an example of how social media rules can be flouted. The 21-year-old, believed to have been the third most important person in ISIS, was killed in a US drone strike in August 2015. Ms Creighton, speaking at a Conservative conference fringe event, said: “He is somebody we have profiled at the Counter Extremism Project going back to 2015. “CEP was highlighting the horrendous content he was repeatedly uploading, the radicalisation of individuals online and directly contributing to some pretty extreme outcomes. He was someone on our flagged list who repeatedly flouted Twitter and was occasionally taken down but was constantly reappearing."