According to Experian Hitwise, Baidu refer 27% of the search traffic to its own web properties, among which the top three are Baidu Knows (or Baidu Zhidao, a Q&A style site), Baidu Encyclopedia (Wiki style site), and Baidu Post Bar (a UGC website similar to a forum).
CIW / Baidu Refer 27% Traffic to Its Own Web Properties