Explicit data is “registration quality data” collected either online or offline. For online registration data, the user has certain attributes in his or her registration profile at a particular site or service, and that data is associated with the user’s Web cookie or some sort of audience database when the user next logs in. Offline registration data includes the sorts of data held in the massive offline direct response industry databases built up over the last several decades. These are then matched to a user online when that user logs in somewhere that is a partner of the data company. The site at which the user logs in, usually an online mail or similar site, sends the name/email combination to the data company, which then makes the match and sends back data. Ethical data providers do not put personally-identifiable data into the cookie or audience database, but rather anonymize the data (e.g., “male” rather than a name or address).