Web 2.0 sites are nothing but a website only, but you can create them free on a sub-domain of that particular platform. E.g. consider Google Blogger.com where anyone can start a blo
In Web 2.0 - We use many things like RSS, Blog, XML, Tagging, Rich Media, Social Networking, Wikipedia, External Blog(Blogspot, Wordpress, Weebly), Sharing content and more.