A system and a method for managing and sharing, within a computer network, information and contacts related to users, according to which the user (UC), on his personal profile (PF) created on the restricted access web site, can create a certain number of business cards (BV) to be booked to given categories of persons, with the information and/or data he considers to inserted into that card; in this way, the system does not allow to a third party to access user's (UC) personal profile (UC), neither in as merely curios observers, and reserves to each user (UC) places for the insertion of their information which, thus, are made accessible only to whom the user (UC) decides to send them and only during the period for which the user (UC) desires to send them. Once the user (UC) comes into contact with a person belonging to the categories to whom he has allowed the vision of the data, he can share, for each category, certain information which are however lent, for a prefixed time period, and automatically updated in real time on personal profile (PF) of then web site.