The definition of cool is constantly in flux. Here's a look at the companies that define cool in 2011. Plus: what it took to make it onto this year's list of 30 superstar young companies—and what the list illuminates about the state of young entrepreneurship today.
Ankur Jain is the founder of the Kairos Society, a network of college entrepreneurs dedicated to changing the world through business. And socializing. Which is, in fact, business.