Build community, forge relationships, participate, organise your stuff.
Characteristics of Web 2.0 applications
- “Network as platform” browser-based functionality
- User generated content
- Easy to connect and share

http://en.wikipedia.org/wiki/Image:Web_2.0_Map.svg#file
The Sharing Toolbar

With the click of a button I can share what I’m looking at through a number of different applications, without having to leave my browser.