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http://en.wikipedia.org/wiki/Web_2.0 A tag cloud (a typical Web 2.0 phenomenon in itself) presenting Web 2.0 themes Web 2.0 is a loosely defined intersection of web application features that facilitate participatory information sharing , interoperability , user-centered design , [ 1 ] and collaboration on the World Wide Web . A Web 2.0 site allows users to interact and collaborate with each other in a social media dialogue as creators ( prosumers ) of user-generated content in a virtual community , in contrast to websites where users ( consumers ) are limited to the passive viewing of content that was created for them. Examples of Web 2.0 include social networking sites , blogs , wikis , video sharing sites, hosted services , web applications , mashups and folksonomies .

Web 2.0 - Wikipedia, the free encyclopedia

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