The acronym MOOC (Massive Open Online Course) refers to platforms that offer on-line education and open courses to hundreds, thousands or even tens of thousands of students simultaneously. The purpose of this article is not to provide an analysis of the phenomenon MOOC in its generality but to offer an original vision of a given MOOC, through its students, their profile and their activity during the course. To do so, we analyze the data collected during a one the first course of the French platform FUN, "Fundamentals in Statistics". We describe the community of students, their socioeconomic profile, their motivations, their activities on the course forum. We also study how the forum exchanges are structured in the course.