I pulled this off of Litttle Red Book, an advertising industry blog that frankly I had never heard about until recently. There's certainly a lot more than these, but this is a good list of the big ones.
Retail / Shopping:
www.taobao.com
www.dangdang.com
www.joyo.com (combined with Amazon.cn)
www.alibaba.com
www.eachnet.com
www.paipai.com
www.bitauto.com
www.huanke.com
Social / Cultural:
www.tianya.com
www.19lou.com
www.xiaonei.com
www.kaixin.com
www.kaixin001.com
www.hudong.com
www.douban.com
www.xici.net
Social / Entertainment:
www.mop.com
www.shanghaining.com
Products / Reviews:
www.dianping.com
www.koubei.com
www.sh.58.com
Wedding:
www.chinajiehun.com
www.liba.com
www.99wed.com
Microblogs / Blogs:
www.fanfou.com
www.blog.sina.com.cn
www.blog.sohu.com
www.blogbus.com
Searching Engines / Forums:
www.sougou.com
www.baidu.com
www.google.com.cn
www.gougou.com
www.soso.com
Video Sharing:
www.youku.com
www.tudou.com
www.ku6.com
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