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WikiChanges is a web-based tool that exposes the revision history of Wikipedia articles using an interactive graphical timeline. See About for more information and a Greasemonkey script to embed timelines in the real Wikipedia.
Last 20 plots: Global_citizenship, Hillary_Rodham_Clinton, Barack_Obama, Autodesk_Softimage, Art_and_Anarchy, United_States_Dollar, Bitcoin, 4chan, Google, Matt_Damon, Web_2.0, Ruth_Bader_Ginsburg, INTJ, Edward_H._Shortliffe, X, Aníbal_Cavaco_Silva, Vassar_College, Xala, twitter, Wiffle_ball.
Plots being processed: Godspeed_You!_Black_Emperor, Rick_Astley, Tour_de_France, enterprise_resource_planning, steve_fossett.