My understanding is that China is blocking US websites that don't censor and/or hand over user data (ie Google, Facebook). The reason RenRen and Baidu have flou

My understanding is that China is blocking US websites that don't censor and/or hand over user data (ie Google, Facebook). The reason RenRen and Baidu have flourished is that they are handing over user data to the Chinese government. I wouldn't be surprised if China was even funding their operations. That information is critical when running a communist regime.