1. A system comprising: a communication interface comprising one or more networking ports to receive a set of web page visit records, the web page visit records comprising at least a user ID, a URL and a timestamp; and a simulation engine comprising logic to access at least a portion of the set of web page visit records and to perform a simulation of a new visit to the URL by a user identified by the user ID, wherein the performance of the simulation of the new visit causes an update to at least one web page visit record of the user identified by the user ID to generate an updated web page visit record.