The Chinese government has become increasingly sophisticated at controlling the internet, taking a multilayered approach that contributes to precision in blocking political dissent, a report released Thursday finds. The precision means that China's filters can block just specific references to Tibetan independence without blocking all references to Tibet. Likewise, the government is effective at limiting discussions about Falun Gong, the Dalai Lama, Tiananmen Square and other topics deemed sensitive, the study from the OpenNet Initiative finds. Numerous government agencies and thousands of public and private employees are involved at all levels, from the main pipelines, or backbones, hauling data over...