Initially I was confused too. I thought that Web is implemented using many standards and technologies and each one has its own version. I decided to do some research...
I come a cross an interesting article that provide my initial insight into this matter.(Follow this link: http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html)
In the nutshell, Web 2.0 is about a new way of using Web. So it is a concept of Web applications where users are now able to contribute to the contents of the website. Should I still call it portal? Perhaps not because portal is about a central point, from there you can get to the place that you want.
Blog is one application of Web 2.0. Everyone is offered a space on the web site, example www.blogger.com, to put up the contents for any one to see or comment. The contents are open to the public or for invited people only. It is about harnessing collective intelligence as quoted in the article by O'Reilly. Never before can information and views be made available so easily and free.
Wikipedia is another example. Wikipedia, an online encyclopedia, is based on the unlikely notion that an entry can be added by any web user, and edited by any other, is a radical experiment in trust.
There is a downside to this, how about the integrity of the information. Who is responsible for the accuracy of the information?
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