Advertising on communication media of all kinds; rental of advertising time and space on communication media; preparation, insertion and dissemination of advertisements; dissemination of sale and purchase offers for vehicles for locomotion by land, air or water; information and consultancy relating to sale and purchase offers and requests for vehicles for locomotion by land, air or water; reception and dissemination of sale and purchase advertisements for vehicles for locomotion by land, air or water, all the aforesaid services being carried out by all kinds of means, in particular by computer and by telematic and/or electronic media; collection and systematic ordering of data in a central file.