9. Yoshikazu Tanaka- Gree

Age: 35

Tanaka founded Gree in 2004, which is now Japan's largest social networking site. . He started out at Sony, and then moved on to work for Hiroshi Mikitani (the billionaire founder of online shopping site Rakuten). His worth is estimated to be $2.2 billion, and he’s reported to have his sights set on building a Gree office in California’s SiliconValley. Should  Zuckerberg watch out? Only time will tell.

10. Kevin Rose

Age: 35

Rose co-founded Digg (a popular news website that competes with reddit), Revision3 (an Internet television network that creates, produces and distributes web television shows), Pownce (a micro-blogging and file-sharing site), and Milk (a company that aims to solve problems of the mobile web, according to TechCrunch).