For years, the internet has been shifting from an information repository to a network of individuals who communicate with each other. Web 2.0 is the term that describes that trend. It not only includes social networking sites, such as MySpace, Facebook, and LinkedIn, but also sites that depend on users for content—YouTube and Wikipedia, for example. Businesses, like Amazon, also build and interact with communities of customers on their sites. Blogging and micro-blogging (like Twitter), both of which are forms of web journaling, are the newest Web 2.0 developments.
The data shows social networking is huge. Facebook, for example, claims to have 175 million users, half of whom are in college. The fastest growing segment of Facebook users, in fact, is age 30 and older. YouTube says 10 hours of video are uploaded to its site every minute, primarily by 18- to 34-year olds, although its demographic reaches as high as 55 years. And MySpace has more than 110 million users, age 18 and older. more »