"But while YouTube is trying to remove violent videos, their site is passively helping in radicalising the disaffected in other ways, according to experts. It does so by creating a rabbit-hole effect, drawing viewers in to related videos with an algorithm specially designed to appeal to them. Joshua Fisher Birch from the New York-based Counter-Extremism Project told nine.com.au YouTube's related videos create a radicalising effect, with the algorithm drawing people in to more and more extreme videos. 'The algorithm really locks people into these echo chambers,' Mr Fisher Birch said. 'A lot of these videos have comment sections where people can reinforce each other's groups.'"