David Karp

Age: 24
Occupation: CEO of Tumblr
Previous TIME 100 appearances: 0

As a young Internet entrepreneur, Tumblr founder and CEO David Karp is in good company. At just 20, Karp created the trendy blogging platform after finding other services less than desirable. Sixteen million blogs later, Karp has elbowed out the competition in the blogosphere, one lolcat at a time.

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