Actually it's by a PhD linguist, who developed his own modified version of PageRank that incorporates sentiment analysis combining Markov chains and multidimensional vector spaces as his thesis. This is just showing off in a potentially profitable way.
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[ 267 ms ] story [ 1985 ms ] threadhttps://news.ycombinator.com/item?id=6094088
Also: It appears to be down.
1. http://technorati.com/social-media/article/tumblr-effectivel...