thanks for your suggestionyou can search on goole...many thing for you
perfect and accurate answer.Web 2.0 describes World Wide Web sites that emphasize user-generated content, usability, and interoperability. They are used to promote your high quality content and build your website reputation in search engines. They help to rank keywords and also generate good traffic to your website.
you can participate in some of the pages I've ever done HubPages, Weebly, iamsport, kidblog, soup.io ...
I have thei website introduces you to the most reputable 2.0 :
Wordpress.com
blogspost.com
Tumblr.com