Abstract: A computerized advertising system may include an input communication system configured to receive information indicative of one or more ads, each for a product or service marketed by a merchant. An ad database storage system may be configured to store information indicative of the ads. A computerized ad circulation system may be configured to controllably cause the ads to be delivered to recipients. A computerized merchant check-in tracking system may be configured to receive check-in information indicative of when each recipient visits each merchant. A computerized merchant billing system may be configured to bill the merchant of each ad based on the number of recipients of the ad that visit the merchant.