How social networks are recruiting teenage extremists

In March, in the aftermath of the Christchurch shooting, I tried to distinguish between internet problems and platform problems. Internet problems arise from the existence a free and open network that connects most of the world; platform problems arise from features native to the platform. The fact that anti-vaccination zealots can meet online is an internet problem; the fact that Facebook recommended that new mothers join anti-vaccination groups is a platform problem.
The recent rise in white