For communities and personalization
Web 2.0 is:
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A resurgence in the web economy.
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Anew level of technological interactivity between web sites and services.
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Or social phenomena deriving from new types of online communities and social networks.
Web 2.0 is not a technology but Web 2.0 needs technology so that typical scenarios can become reality:
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Participation of users, e. g. by contributing to online forums and wikis, writing blogs, or uploading content;
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Networking and communication between users;
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Personal adaptation of websites by the users themselves