Marc Andreessen says in this post on his blog and
I agree with his take on the subject despite the fact that Web 2.0 is in the title of this blog. I have stated in earlier posts that sticking to numbers is not really important. It’s just the web which keeps evolving due to the great new tools that are being developed under whatever name you want to call it – the next web, semantic web, common sense web.
One thing is sure, all this will mean an ever more useful and influential web touching on every aspect of life in new ways that few of us have even started to imagine.