China is remarkably successful at scrubbing its Internet of social dissent. Twitter and Facebook have been blocked ever since deadly ethnic riots in 2009. Chinese social media platforms employ armies of internal censors to take down posts, images and even emoji.
But this month, coordinated dissent has popped up in an unexpected place: GitHub, the world's largest open-source site that lets programmers collaborate on code. (GitHub is owned by Microsoft, which is an NPR funder.)