Identification of users for advertising purposes

A method for identifying users for advertising purposes, said method comprising:

• identifying a plurality of users and a plurality of attributes, each attribute being a subject, an activity, or a demographic characteristic;
• identifying a first network of first web sites of the Internet accessed by the plurality of users, said access to the first web sites provided to the plurality of users by a first at least one Internet Service Provider (ISP);
• receiving, from the first at least one ISP, first data comprising content of the first web sites and time data pertaining to when each user of the plurality of users accessed the first web sites;
• analyzing the first data to determine first attribute values comprising a first value of each attribute of the plurality of attributes for each user, said first value being indicative of a level of interest in each attribute by each user, said analyzing based on an amount of time spent by each user at each website of the first web sites in relation to the content of each website of the first web sites;
• identifying a second network of second web sites of the Internet accessed by the plurality users, said access to the second web sites provided to the plurality of users by a second at least one ISP;
• deriving, from questionnaires completed by the plurality of users, second attribute values comprising a second value of each attribute of the plurality of attributes for each user, said second value being indicative of a level of interest in each attribute by each user, attribute values of said second attribute values having been indicated on the questionnaire by the users of the plurality of users for each attribute to which a keyword relevant to the second web sites has been mapped;
• determining third attribute values that comprise a third value of each attribute of the plurality of attributes for each user, by combining the first attribute values for each user with the second attribute values for each user;
• processing the third attribute values, said processing comprising determining from the third attribute values an identification of a subset of the plurality of users to whom advertising of a product or service may be directed;
• and
• communicating the identification of the subset of the plurality of users to a provider of the product or service.