Found here: http://imgur.com/gallery/fNeC6ec
Stashed in: Infographics!, Darwin, Favorite and Forget
Compare with the Histomap of History, also by John B. Sparks:
Mila Kunis's haters are proof that bigots are idiots.
R.I.P. Lou Reed
Ryan and His Budget Are a Gamble for Romney - NYTimes.com
'Prometheus' explanation (spoiler)