Web 2.0 refers to the second-generation of Web-based services that emphasize online collaboration and sharing among users [1].It has recently attracted more and more people's attentions because of the popularity of the Websites with user generated content such as Flickr, Myspace and Youtube.
Youtube [2] is a famous Website in which users can share videos with others. It is a typical Web 2.0 application. The more the users share videos, the more videos they can watch. In this application, it is the video data that users upload, not the software itself, that is worth a lot of money. People are willing to share videos, because they share for the community and for themselves.
[1] http://en.wikipedia.org/wiki/Web20
[2] http://www.youtube.com/
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