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Tumblr was founded by David Karp in Febreuary 2007.
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Tumblr was launched on April 27, 2007 by David Karp
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With Tumblr's 2009 acquisition of Tumblerette, an Apple Inc. App Store application created by Jeff Rock and Garrett Ross, the service launched its official iPhone app in 2009
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In 2009, Tumblr had an 85% retntion rate, compared with 40% of Twitter.
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August 1, 2009, David Karp was named Best Young Tech Tech Entrepreneur 2009 by BusinessWeek.
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Tumbr became available on BlackBerry smartphoe on April 17 ,2010 via a Mobelux application in the BlackBerry App World.
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In August 2010 Tumblr was named as a finalist in Lead411's New York City Hot 125.
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On October 21, 2011, Tumblr became the first bloggong platform to host President Obama's Blog
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in June 2012, Tumblr feautred it's first major brand advertising campeign in conjinction with Adidas,
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In August 20,2012 Tumblr had over 69.4 million blogs and more than 29.8 billion total posts
