Online advertising in China
Online advertising in China reached 20.61 billion Chinese yuan in 2009, up 21.2% from 2008.

Internet users
According to Internet World Stats, China's online shopping population reached 8% of the total Chinese population in 2009, and the number of internet users in China reached 485 million in June 2011. They spend 1 billion hours online each day and the number will double to 2 billion by 2015. China's online shopping population is estimated to increase to 19% of the total population by 2012.

Search engine advertising
The key players in China's search engine advertising are Tencent, Soso, Baidu, Sogou, Google, Bing and Yahoo! China. After Google decided to pull its search engine out of the Chinese market in early 2010, Tencent became the top choice for search engine advertising in China. Tencent's advertising platform is in Chinese.

References 

China
Advertising
Advertising in China