#13 David Karp
Company: Tumblr
David Karp is an American entrepreneur who developed the short-form blogging platform 'Tumblr'. MIT Technology Review TR35 placed him amongst the 35 highest ranking innovators of the world below the age of 35. With a net personal wealth of $200 million and his company valuing at $800 million, Karp is one of the richest entrepreneur under 30.
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