In this article, the "multiple voices" of 13-15-year-old German and Italian adolescents in internet guest-books are analyzed. The study is based on guest-books texts with a mixture of different registers, languages and dialects. In particular, the German adolescents from the Augsburg region (Bavaria) display a strong regional linguistic identity in combination with a tendency to the use of global English. In the Italian texts Spanish is adopted in various creative ways. Furthermore, the article raises the issue of the sociological implications of this specific use of multiple codes. (Contains 2 notes.)