A version in traditional Chinese is also available for users in Hong Kong and Taiwan.

Facebook has already released French, German and Spanish versions this year. According to Reuters, about two-thirds of its more than 67 million users are from outside the United States.

Its strongest rival, News Corp.'s MySpace, launched a Chinese-version site in April 2007, and is available in more than 20 countries.

The boom of Facebook has resulted in Chinese copycats, such as Xiaonei.com and Zhanzuo.com, Reuters reported Friday.