From Reuters:
Online social network site Facebook.com has launched a version targeting mainland Chinese Web surfers to compete with local and overseas rivals in the world’s largest Internet market.
Facebook users in mainland China accessing the website are redirected to zh-cn.facebook.com, which is in the simplified version of Chinese used on the mainland.
A version in traditional Chinese, the script used in Hong Kong and Taiwan, is also available.
A spokesperson was not immediately available for comment.