Previous work includes investigations of censorship practices of search engines provided by Google, Microsoft, and Yahoo! for the Chinese market along with the domestic Chinese search engine Baidu. In 2008, Nart Villeneuve found that TOM-Skype (the Chinese version of Skype at the time) had collected and stored millions of chat records on a publicly accessible server based in China. In 2013, Citizen Lab researchers collaborated with Professor Jedidiah Crandall and Ph.D. student Jeffrey Knockel at the University of New Mexico to reverse engineering of TOM-Skype and Sina UC, another instant messaging application used in China. The team was able to obtain the URLs and encryption keys for various versions of these two programs and downloaded the keyword blacklists daily. This work analyzed over one year and a half of data from tracking the keyword lists, examined the social and political contexts behind the content of these lists, and analyzed those times when the list had been updated, including correlations with current events.