a host of domestic Chinese companies are competing to fill the space. RenRen Inc., which runs one of the biggest Facebook-like sites in China, raised $743 million in a U.S. initial public offering in May that it is using to beef up its offerings. Rival Kaixin001, held by Happy Networks Ltd., also operates a social-networking site similar to Facebook. Chinese search giant Baidu Inc. is trying to turn its popular message board, Baidu Tieba, or Postbar, into more of a social network, and had its own microblogging service, Baidu Shuoba, or Baidu Talk, which failed to gain traction against Sina and now has been suspended. Sohu.com Inc. and NetEase.com Inc. offer microblogs.