Web 2.0

Web 2.0, a phrase coined by O'Reilly Media in 2004,[1] refers to a perceived or proposed second generation of Internet-based services—such as social networking sites, wikis, communication tools, and folksonomies—that emphasize online collaboration and sharing among users. O'Reilly Media, in collaboration with MediaLive International, used the phrase as a title for a series of conferences, and since 2004 some members of certain technical and marketing communities have adopted and loosely adapted the phrase. Read more here: http://en.wikipedia.org/wiki/Web_2