Today, young people write in their leisure time far more than they did 15 years ago. Most often they use new media to do their writing. This book explores whether the frequent writing of short messages and e-mails and participation in chats and social networks like Facebook have an influence on writing in school. Are there any similarities and relationships between the texts written in school and the private texts? For the first time, based on comprehensive data from Swiss students, this book provides empirical answers to these questions.