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Web 2.0 is the second generation of Web development. It facilitates communication, secure information sharing, interoperability, and collaboration. Web 2.0 concepts have led to the evolution of Web-based communities, hosted services, and applications such as socialnetworking sites, video-sharing sites, wikis, blogs, and folksonomies. Web 2.0 enables users to run applications entirely in a Web browser. Users own the data on a Web 2.0 site and exercise control over that data. Web 2.0 sites, with their architecture of participation, encourage users to add value to the applications they use. This differs from traditional Web sites, which are solely for information retrieval and modifiable only by their owners.