天涯BBS:http://www.tianya.cn/ 这个比较多人用奥！

baidu(百度),百度贴吧http://tieba.baidu.com/index.html 天涯BBS:http://www.tianya.cn/ 新浪论坛:http://people.sina.com.cn/ 搜狐论坛:http://club.sohu.com/ I think they are bigger and better than others.I think Baidu is biggest BBS.

In my opinion, baidu is the biggest BBS

i think it is 天涯BBS:http://www.tianya.cn/

中华网社区： http://club.china.com/data/threads/1011/ 百度贴吧 http://tieba.baidu.com/index.html http://orichinese.com