Moreover, in the lasted Web 2.0 conference by OrangeLab, 51.com was invited to talk about "the typical Chinese Web 2.0 user". "5" in Chinse sounds like "I" and "1" sounds like "want". So "51" means " I want". Maybe that is a social networking site.
I am trying to get a sense of the huge Internet market here in Beijing. However, it seemed to me that not many people are on the so-called social networking sites... A lot of people have never heard of web 2.0 or social networking or Facebook. Nonetheless, it seemed that they are on the social websites (forums, bbs etc).