1. A method comprising: receiving, in a mobile terminal device related to a user, a preference profile including identification data and preference data related to at least another user, from a mobile terminal related to said at least one other user; saving said received identification data and said received preference data in a user database within the mobile terminal device related to said user, said user database containing preference data of at least a third other user; comparing, in the mobile terminal device related to said user which received the preference profile, said received preference data with the preference data contained in the user database for determining users of substantially matching preference data, wherein the comparison is based on a user-defined degree of non-matching preference data included in preference data related to the user; determining, in the mobile terminal device related to said user which received the preference profile, a plurality of users having said substantially matching preference data; and sending a notification, from the mobile terminal device related to said user which received the preference profile, to each of said mobile terminals related to said determined users.