1. Device (D) for determining potential interest(s) of user(s) (Uj) that is/are client(s) of at least one network operator, each user (Uj) being associated to a profile defining at least his interests, wherein it comprises i) a tracking means (TM) arranged for analyzing the profile of at least one user (Uj) to determine new real interest(s) it contains and for storing an identifier representative of a determined new real interest of said user (Uj) in correspondence with a first date at which it has been considered as a new real interest into his profile, and ii) a recommendation means (RM) arranged for analyzing the first dates of a user (Uj) to determine a time ordered sequence of interests preceding a determined new real interest and for comparing this determined user interest sequence to at least one other sequence of interests of at least one other user (Uj′) to predict at least one potential future interest for said user (Uj), to be introduced into his profile.