01/30/2012 09:25 am ET

David Karp, Founder Of Tumblr, On Realizing His Dream

"I was so silly -- I tried to be very formal and put on a deep voice to clients over the phone so I didn't have to meet them and give away how young I was," he says. "I lied about my age. I lied about the size of my team. I lied about my experience. I was so terribly embarassed about it for so long. I should have just owned up."

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