Kevin Roose op The New York Times:
There is no offline equivalent of the experience of being algorithmically nudged toward a more strident version of your existing beliefs, or having an invisible hand steer you from gaming videos to neo-Nazism. The internet is now the place where the seeds of extremism are planted and watered, where platform incentives guide creators toward the ideological poles, and where people with hateful and violent beliefs can find and feed off one another.