Creator Tested on/found from # of keywords Year Method + source The Citizen Lab Sina UC 1,818 2013 reverse engineered from the client; more analysis here; download link The Citizen Lab Tom-Skype 2,574 2013 reverse engineered from the client; more analysis here; download link The Citizen Lab LINE 673 2014 reverse engineered from the client; more analysis here; download link Jason Q. Ng (Blocked on Weibo) Sina Weibo 839 2013 running Wikipedia China article titles through Sina Weibo search; more analysis and book Xia Chu Great Firewall 669 2014 HTTP request scans of Wikipedia China articles to see if they'd trigger GFW block; more analysis here; download link (removed duplicates and keywords related to meta and user pages) China Digital Times Sina Weibo 2,448 ongoing crowdsourced testing of suspected sensitive keywords on Sina Weibo; more analysis on CDT and in CDT's Grass Mud Horse Lexicon e-book; download link GreatFire.org Wikipedia 488 2013 testing to see if Wikipedia pages are available in China; more info; download link Google/ATGFW.org Google/Great Firewall 456 2012 ATGFW.org and GreatFire.org reverse engineered the keywords Google was using to warn users of censorship while using their service in China; download link