This study investigates the hypothesis of young people having the multi-skills required to switch between formal and informal communication. We collected samples of the written output of students across different media and communication situations. The results obtained through dictation tests show that the students’ level is relatively low, with a majority of grammatical errors. The analysis of linguistic forms common to the corpora indicates that all the participants use traditional spelling in at least one of them. Lastly, we present a qualitative analysis of spelling variation and an overview of the teenagers’ linguistic representations.