The Chinese government has launched a massive crackdown on prostitution in Dongguan, a well-known sex industry hub in southern China.
In addition to a news feature on China Central Television about the corruption of the sex industry in Dongguan, the official Sina Weibo published an eight-hour population in-flow and out-flow map of Dongguan city, which has been interpreted as the escape path of “prostitutes” and “prostitution clients” during the crackdown. Generated by Baidu Qianxi with data from Baidu map, the map indicated that most people fleeing the crackdown “escaped” to Hong Kong.
Originally, Baidu Qianxi was designed as a visualization tool that could map population flows during the Chinese Lunar New Year. But as Luo Changping at Letscorp pointed out [zh], the fact that Baidu Qianxi was able to appropriate the data surrounding the prostitution crackdown suggests that authorities are using mass surveillance to track these patterns, rather than only targeting criminal suspects, and thereby violating the personal privacy of untold numbers of citizens.