As his score rose, so did the number of job offers and speaking invitations he received.

FORBES: Do You Have Klout? Employers Want To Know

A., he had started to write a memoir and had speaking engagements and other invitations in Berlin, New York, Seoul, and Cambridge, along with offers to serve as a nuclear-energy adviser.

NEWYORKER: The Contenders

Using e-mail invitations and Web banner ads, the company trolls for members and offers them a chance to register to win a free product, like a DVD player.

FORBES: On The Cover/Top Stories