Tim O'Reilly
Like many important concepts, Web 2.0 doesn't have a hard boundary, but rather, a gravitational core. You can visualize Web 2.0 as a set of principles and practices that tie together a veritable solar system of sites that demonstrate some or all of those principles, at a varying distance from that core.a...

In other worlds Web 2.0 is just another way of saying internet today or Web in early 21st century.

William Gibson
The past is past, the future unformed. There is only the moment, and that is where he prefers to be....