Data visualization company Uncharted has created TorFlow, a data visualization that maps traffic on Tor, the international network of servers that allow users to browse the Internet relatively anonymously as well as access the “dark net”—unlisted websites frequently used to facilitate illicit transactions, such as the now-defunct drug trafficking marketplace Silk Road. TorFlow illustrates the flow of data between Tor servers around the world on a daily basis beginning on November 8, 2007. By comparing different time intervals, users can observe the growth of Tor traffic in various regions in response to world events such as in Egypt at the beginning of the Arab Spring in 2011.