Web 2.0 is a term coined in recent years that describes the changing trends in the use of World Wide Web technology and web design that aim to enhance creativity, information sharing, collaboration and functionality of the web. Web 2.0 concepts have led to the development and evolution of web-based communities and hosted services, such as social networking sites, video sharing sites, wikis, blogs, and social indexes.
Here is a list of the top 15 websites that have been influential in establishing these methods of functionality on the web.