TumblR
short-form WebLog (TumbleLog) publishing site
also Universal Outbox RSS republisher
http://en.wikipedia.org/wiki/Tumblr
http://www.marco.org/2013/05/20/one-person-product
Fred Wilson has one
http://www.quora.com/Tumblr/How-did-Tumblr-get-traction
acquired by Yahoo mid-2013
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