What is Web 2.0?
by Tim O'Reilly 09/30/2005 Oct. 2009: Tim O'Reilly and John Battelle answer the question of "What's next for Web 2.0?" in Web Squared: Web 2.0 Five Years On .
A tag cloud (a typical Web 2.0 phenomenon in itself) presenting Web 2.0 themes. An interactive version is available here . The term Web 2.0 was coined in 1999 to describe web sites that use technology beyond the static pages of earlier web sites.