System and method for presenting targeted content

A method, performed by an aggregator computer system, for providing an entity of content targeting a specific user to a first computer system operating a first website, the aggregator computer system having access to a database storing, for each of a plurality of users, a respective user identifier used to identify the respective user and aggregated activity information of the respective user, the method comprising steps of:

• receiving, from a computing device of a first user, a first set of identification information of the first user identifying the first user;
• generating, by the aggregator computer system, a first user identifier using the received first set of identification information of the first user, and storing the generated first user identifier in the database such that the first user becomes added to the plurality of users of the database and the stored first user identifier becomes the respective user identifier used to identify the first user;
• aggregating, by the aggregator computer system, activity information about the first user from each of a group of one or more website computer systems each operating a respective website, to form the aggregated activity information of the first user stored in the database, the stored aggregated activity information of the first user including one or more sets of activity information of the first user each indicating prior activities which the first user conducted on the respective website of one website computer system among the group of one or more website computer systems;
• receiving, from the first computer system, a second set of identification information of the first user, and matching, by the aggregator computer system, the received second set of identification information of the first user, with the stored first user identifier of the first user;
• generating an entity of content targeting the first user using the aggregated activity information of the first user stored in the database;
• and
• sending, to the first computer system, the generated entity of content targeting the first user, for the first computer system to present the generated entity of content by incorporating the generated entity of content into a content page of the first website displayable on a user terminal visiting the first website.