Those remaining include Quattro, text messaging specialist 4INFO, mobile video advertising company Transpera, and mobile advertising network Millenial Media.

FORBES: AdMob: Who's Next?

Glam Media, a women-focused online content and advertising company, has acquired social network creator Ning, in a large advertising and online media tie-up.

FORBES: Glam Media Acquires Ning In Ad-Social Publishing Tie-Up; Andreessen Joins Glam Board

Mr. Chao is currently a director of Focus Media, an out-of-home media and advertising network company, NetDragon Websoft Inc.

FORBES: Charles Chao

Whereas in the 1990s, Web companies shelled out tens of millions of dollars on advertising to find users, today's social media leaders like LinkedIn acquire new users through network effects -- their services become more valuable to users when their friends sign up.

CNN: LinkedIn's IPO is a watershed moment for social media

Right now has significant investments in several Chinese stocks including China Media Express Holdings ( CCME) , a Hong Kong based company has a television advertising network displayed on buses and other urban areas.

FORBES: Your Pushy Wife May Be Your Ticket To Billions

The CMO Network on Forbes.com is the must-read, go-to spot for the latest marketing, advertising and media news, trends, insights and analysis.

FORBES: Magazine Article