@book { MetaphorsoftheWeb20, title = "Metaphors of the Web 2.0", subtitle = "With Special Emphasis on Social Networks and Folksonomies", author = "Alexander {Tokar}", year = "2009", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-00721-3", url = "https://www.peterlang.com/document/1054080" }