Web 2.0 is one of those difficult conditions that do not seem to be no definitive definition. In general, the idea of second-generation version of the web, it is actually based on the same platform as the "Web 1.0" and a few new tricks to it. The general consensus seems to be a website that allows visitors or modify the contents of the site.
Using this definition, then all the blogs and forums should be considered as Web 2.0, and in many circles this is considered true. However, there are a number of new sites out there that seem to define the Web 2.0 a bit 'better. Some of these sites are wikis, social networking sites and sites that allow users to create their own content, like Squidoo, Hubpages, Qassir (now called Qondio), and even Twitter. Reasons of simplicity, the links on this page to a building, these are the different sites I am going to focus on. At the bottom of this article you will find a list of some sites I found most useful.
So why are they useful? Very specifically, you have control over how the site links to your site, what the question on the page linked to your concerns and what are the conditions on the side. Often these places are very high PR sites and internal promotional tools to help you promote the page. Throw some links on these pages from other sources and binding, it is very easy to get a PR3-PR4 page that is specially designed for on your link and the page you're linking.
So what's the catch? Mostly it's just time and effort with very little cost to you. Here are the basic steps for creating content on these sites.
1. Join the site
2. Choose the phrase that was used in the URL of your new page
3. Writing unique content to place page (usually 2-3 400 + word articles on the subject)
4. Make sure you write optimized, your keywords are at the forefront in the articles
5. Add any other modules that will make the page look good, in general, including pictures, videos, lists and other parts of the site offers, you can add to your page.
6. Find out what your site offers how tags and other promotional tools, and put many of them, as you can. These are often the addition of you in groups with other similar types of pages.
7. Finally get links pointing to your new page. This ensures that your page will be indexed quickly and gain PR.
Many webmasters also add a little money in modules so they can make money and get the link to their sites.
Using this method you can get some very important links to your site, high PR sites that have a lot of authority. All at very low cost (no time)
Here are some sites I found most useful
* Squidoo
* Hubpages
* Qondio
* Collect
* Knol
* Zimbio
* Bukis
* LaunchTags
Tumblr *