What: CEO Where: Pinterest, Palo Alto, Calif. Why: Silbermann's pinboard-style photo sharing site seemingly came out of nowhere in the past year to become a major social media player. The financial community endorsed it with a $100 million venture investment in May, underscoring the value of Pinterest's 10 million monthly unique visitors. The company is considering offering ads, but currently is focused on growth.

PRINTED FROM: http://www.btobonline.com/apps/pbcs.dll/article?AID=/20120716/PEOPLE0301/307179967/1199/whoswho-social&template=printart