The present study analyzes an educational blog maintained by a teacher in a preparatory course for an English language proficiency examination. The theoretical background of the study centers on the concept of genre as a recurring social action shared by a discourse community (Miller, 1994; Swales, 1990) and also on the notion of a system of genres (Bazerman, 2005). The system under study here emerged during the work of the teacher and the students towards the creation of the blog itself. The qualitative study consisted of, first, the tabulation of the genre system and then the investigation of genres that might be included in the blog, other than those common in classroom settings, considering that the blog is a multimedia digital genre. Through the analysis of a questionnaire sent to nine students participating in the blog, I also sought to check their perceptions as to the advantages of using the blog as far as their learning process was concerned. The data analysis showed that the genre system built during my observation consisted basically of a system that is very similar to one that might be observed in the traditional classroom environment. The results of the analysis of the questionnaires also showed that, for most of the students, blogging is seen as beneficial in terms of their learning although many students did not participate consistently in the activities proposed by the teacher. The pedagogical implications of this research indicate the need to reflect on the role of new digital genres concerning teachers’ pedagogical practice and the possible contribution of these virtual genres in the teaching and learning process for foreign language nowadays.