NEW YORK, NY - JULY 11: David Karp, founder of the micro-blogging site Tumblr, uses his phone before opening the NASCAQ Exchange on July 11, 2013 in New York City. Tumblr was bought by Yahoo! for $1 ... more 
NEW YORK, NY - JULY 11: David Karp, founder of the micro-blogging site Tumblr, uses his phone before opening the NASCAQ Exchange on July 11, 2013 in New York City. Tumblr was bought by Yahoo! for $1 billion in May; Karp is estimated to be worth $200 million. (Photo by Andrew Burton/Getty Images) less 
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Getty Images | Photo By Andrew Burton / Getty Images
Thu, Jul 11, 2013 10:54 AM EDT