Abstract: A method of tracking the distribution of information, the method comprising: providing to a first user a first token comprising a first unique identifier and a first address; storing in a first database table a link between the first user and the first token; receiving at the first address a request from a second user, the request being made using the first token which has been received by the second user from the first user; storing in a second database table a link between the first token and the second user; providing to the second user a second token comprising a second unique identifier and a second address in response to the request; and storing in a third database table a link between the second token and the second user.