1. A method to identify a current user of a computing device, comprising: identifying activity associated with a first cookie having a first type; in response to identifying the first cookie, parsing the first cookie to identify a first panelist; when the first cookie includes an identifier associated with a first panelist, associating current usage activity of the computing device with the first panelist; and when the first cookie includes an identifier unassociated with the first panelist, associating current usage activity of the computing device with a guest.