Pixel,

If you are asking what web 2.0 websites are they are sites like Wordpress.com or similar dynamic sites. The term web 2.0 was coined back in the 90’s and was used as a blanket term to refer to new websites that weren’t just static pages like early websites were. Web 2.0 sites are commonly used to build backlinks and are also great for starting a web presence and adding content with little or no programming knowledge.

Here is a list of some of the most popular ones,

Top 15 Most Popular Web 2.0 Websites

Hope that answers your question,

Shawn

Wikipedia has a very insightful and detail oriented page on web 2.0
Check it here
Web 2.0 - Wikipedia, the free encyclopedia

Yes, They are helpful for both referral traffic and for seo

Dynamic sites like social media I think.

Originally in 2004, Web 2.0 was referred to as this idea of the "Web as a platform". The concept was such that instead of thinking of the Web as a place where browsers viewed data through small windows on the readers' screens, the Web was actually the platform that allowed people to get things done. But this really didn't catch on. In fact, it's fairly hard to grasp what that really means.

Now Web 2.0 is really starting to mean a combination of the technology (like AJAX) allowing the customers to actually interact with the information. Web 2.0 is starting to mean the situation where amateur writers and developers are able to create applications and Web sites that get more credibility than traditional news sources and software vendors. This combination of powerful JavaScript tools like AJAX enabling nearly anyone to contribute to and interact with the data that we are all working with is really what Web 2.0 is.


Chances are you're already using some application that is a form of Web 2.0. Some of the most popular examples are:

• Gmail
• Google Maps
• Flickr
• Del.icio.us
• Tecnorati
• Digg

Web 2.0 marketing is all about giving your website’s traffic a boost by enhancing its SERP rankings. In other words, Web 2.0 properties can be effectively used to get more inbound links and thus build a stronger web presence. This easily gains the attention of all the major search engines when they crawl and discover your website’s URL on hundreds of websites all over the Internet, giving them a real reason to push your site up.

Relevancy is one of the biggest advantages that web 2.0 has to offer when building one way links to your site. The perfect examples being content sharing sites such as Hub Pages and Squidoo, which are seen as authority sites by the search engines. When you share content on these authority sites by creating your own pages and linking back to your own site, it helps you surge past the competition and achieve high search engine rankings in no time!

If you have fresh and unique web content then and then web2.0 can beneficial for you.....

Web 2.0 is the term given to describe a second generation of the World Wide Web that is focused on the ability for people to collaborate and share information online.

But people no longer stay with web 2.0 but web 3.0

Web 3.0 is is the popular view held by Tim O'Reilly. In contrast, Nova Spivack defines Web 3.0 as connective intelligence; connecting data, concepts, applications and ultimately people. While some call the The Semantic Web 'Web 3.0', Spivack's opinion is that The Semantic Web is just one of several converging technologies and trends that will define Web 3.0