Web 2.0, a phrase coined by O'Reilly Media in 2004,[1] refers to a perceived second-generation of Web based communities and hosted services — such as social networking sites, wikis and folksonomies — that facilitate collaboration and sharing between users. O'Reilly Media titled a series of conferences around the phrase, and it has since become widely adopted.
Though the term suggests a new version of the Web, it does not refer to an update to World Wide Web technical specifications, but to changes in the ways systems developers have used the web platform. According to Tim O'Reilly, "Web 2.0 is the business revolution in the computer industry caused by the move to the internet as platform, and an attempt to understand the rules for success on that new platform." [2]
Some technology experts, notably Tim Berners-Lee, have questioned whether one can use the term in a meaningful way, since many of the technology components of "Web 2.0" have existed since the beginnings of the World Wide Web.[3]
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