"Web 2.0" refers to the trend of designing websites in such a way that their appearance is significantly influenced by their users. The spectrum includes video, photo, and music portals; exchange platforms for goods and information of various kinds; large and small online communities for diverse groups and interests; the text networks of the blogosphere; the scene of wiki-based knowledge collections; and much more. With user numbers in the hundreds of millions worldwide each day, Web 2.0 has definitively transformed the Internet into a mass medium. It is also beginning to have a lasting impact on the world outside the web, even changing it. In the American election campaign, a candidate has, for the first time, acquired most of his active and financially capable supporters via the Internet.