1. A computer-implemented method, comprising: receiving a cookie relating to a visitor of a website, wherein the cookie includes information indicating whether a repository exists for the visitor; determining, on a computing device, if a repository exists based on the information stored in the cookie, wherein information stored in the repository is used to determine a follow-up action to take based on an activity of the visitor during a prior visit to the website, wherein the information stored in the repository is different from the information stored in the cookie; retrieving, on the computing device, the information stored in the repository; determining, on the computing device, a follow-up action to take based on the information stored in the repository; performing the follow-up action; and revising the repository when one or more activities of the visitor are detected on the website, wherein the revised repository includes new information used to determine one or more follow-up actions.