Network label (tag) is an Internet content organization, is a strong correlation keyword, it helps people easily describe and classify content, in order to facilitate the retrieval and sharing, TAG has become a key element of Web 2.0.
The label will content the organization right from the webmaster to the user's hand, fully embodies the WEB2.0 bottom-up, User participation features.
If you have visited Flickr (photo), Technorati (blog), etc web2.0 Site you will find that the site uses tags (tag) to display content, users use tags to describe content and retrieve related content.
The "open categorization" used by Baidu Encyclopedia is also a form of labelling.
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