Characteristics of Web 2.0
User Participation
Web 2.0 focuses a lot on the involvement of the user with the web. Such include user-generated content like Wikipedia and reviews/ratings for items like purchases on ecommerce websites. User's feedback are important for improvement.
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Emergent Data
With mass user participation and the focus on data-driven applications, websites are able to harness mass hard-to-recreate data intel. These data can be used to further improve and enrich user experience, but can also be used to track users.
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Multiple Platforms
The growth of modern electrical technology has allowed people to access the internet and the web from devices other than their personal computer. Such includes mobile smartphone and even, possibly, a refrigerator. Websites have to be able to acccomodate these devices.
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Service
Web 2.0 focus on providing services over software package. These services should be easy to update. It should also cover the long tail, seeking out niche demands.
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Lightweight Models
Web 2.0 and its websites are constantly growing, changing, and adapting. Lightweight models are needed to support this, in aspects of user interface, development, and business.
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