If you're looking for an example of how much impact a young person can have, consider Evan Williams. A few years ago Ev was living in Nebraska and California dreaming. He moved to San Francisco, co-founded a small company called Pyra, and as part of a larger product that never got finished, he created a way to make it easy for people to publish their writing just by filling in fields in a browser. That turned out to be the real product and when they named it Blogger they established the verb that defines what I'm doing as I write this. Pyra suffered after the dot-com meltdown and shrank until Ev was its only employee. He got an infusion of enough money to hang on, improved the software, and early in 2003 hit the jackpot: he sold the company to Google and became one of its most widely known employees.

You can follow the whole saga by reading Ev's blog, Evhead. The archives go all the way to 1999 and they're like a time capsule of the rise and fall and rise again of this new world.

He's still in his 20s.