Web 2.0 the new phenomena

The web is now becoming more important than ever, from social networking to researching. The concept of web 2.0 began after the dot.com crash in 2001 but there is a huge disagreement over what it really means. Is it a new convention or a meaningless market?
The term basically refers to a new brand of websites such as: Napster and Wikipedia.
Web 2.0 is a set of principals and practices that tie together a veritable solar system of sites. Doubleclick and Akamai were the pioneers., with Google being the standard bearer.
So if you haven't yet joined the rest of the cyber world and signed up to Facebook or Myspace then what are you waiting for...