1. A computer-implemented method of presenting on a mobile communication facility an advertisement in association with a webpage, the method comprising the steps of: receiving an advertisement request associated with a webpage request from the mobile communication facility operated by a user, wherein the webpage request is received over a cellular telephony infrastructure provided by a carrier, wherein the webpage request corresponds to a webpage provided by a webpage content provider, wherein the user is paying for use of the mobile communication facility with the carrier; receiving information relating to one or more user characteristics, wherein the user characteristics are derived from information obtained through the carrier including: (a) a plurality of demographic datum of customers of the carrier, or (b) purchase history data of the user as recorded through use of the mobile communication facility, wherein the purchase data includes views of or purchases of goods or services; determining that the relevance to the user of a first advertisement with the webpage is greater than the relevance of a second advertisement with the webpage based at least in part on the information relating to the one or more user characteristics; associating the first advertisement with the webpage; and transmitting the advertisement associated with the webpage to the mobile communication facility for presentation on a display of the mobile communication facility.