Founder, LinkedIn; angel investor
Age: 39
Hoffman may not be your "friend," but when it comes to doing business in Silicon Valley, he's one heck of a "connection" -- as LinkedIn, the social network he founded, calls the people users add to their profiles. That all-business approach comes straight from the hyperlinked Hoffman's sideline as an angel investor backing today's hottest startups, including Facebook, Flickr, Digg, and Technorati. Age: 39
View all candidates
Tell us who you think matters now -- and why