David Karp, the founder of the blogging platform Tumblr, was 17 when he decided to cut the apron strings and move to Tokyo. With a smattering of Japanese and a sharp eye for computer code, the impatient Manhattan teenager embarked on a period of self-discovery. "I was holed up in the middle of this world where it was just me on the internet," Karp recalls. Within weeks, he had fine-tuned his computer skills and cooled on the idea of building robots. He wanted to be an entrepreneur. But there was one small problem: his voice. "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."