A lot of my friends in Grad school are Chinese. Actually, I was seeing one of the Chinese girls in my cohort... That aside to demonstrate I have some clue what I'm talking about...

China bans Google, Facebook, Twitter, Youtube, and several other things. They have government sanctioned versions which look VERY similar to their counterparts (renren looks 100% ripped from Facebook, and Baidu functions just like Google.)

A lot of it has to do with not wanting the outside world to influence people. Essentially, China doesn't want anyone to get any ideas about protesting or government overthrowing like the Arab Spring. So it's highly unlikely the legitimate Chinese players (Not talking about RMT farmers, we're talking about people who actually play for fun) will be on the same servers. They do not want Europeans, Americans, and Japanese people influencing the thinking of their people. Essentially laws and politics will prevent them from playing with us. It's a shame too. But anything that threatens the governments grip on the people isn't allowed. Which makes it a pain in the ass when you want to talk to a girlfriend in China during summer vacation, because her American phone is disconnected, she can't use Facebook, so you have to rely on school e-mail or I think skype works...