Mr. Zuckerberg's creation, an Internet service that allows students to post personal information and photos, is nothing short of a twister sweeping college campuses, keeping millions up to date on their friends' lives and dating status. There was a reputed $1 billion plus offer from Yahoo!, turned down, natch. Even more remarkable is that Mr. Zuckerberg is all of 22 years old. What is it that made Facebook become so valuable in less than three years? And will 22-year-olds with 200 employees come up with all the good ideas from now on?