These tech-world luminaries - photographed during our recent Brainstorm Tech conference - aren't just changing the game; they've defined it. Photographs by Robyn Twomey.
You could join Facebook or MySpace, but Ning CEO Gina Bianchini wants you to build your own social network.
Her two-year-old startup, launched with Netscape founder Mark Andreesen, offers a platform for connecting people around interests and passions.
As of July, Ning had 29.3 million users across 1.3 million Ning-constructed networks.
NEXT: Davie DeWalt