Likewise, Web 1.0 was developed by a physics researcher, Web 2.0 is been used and developed for people from different areas of knowledge.
Now, Web 2.0 is been used for the users to display different situations of your life but also the researchers are using it as a mechanism for supporting the development process of knowledge.
The Wiki framework is one of the most successful mechanisms for sharing knowledge as much as informal and formal way.
Today, researchers are advocated to open their knowledge to the world, of they will be condemned to the failure and isolation.
Scientific American has an interesting article about this topic (http://www.sciam.com/article.cfm?id=science-2-point-0&print=true).