Independent, non-profit organization comprising of, and supported by, publishers, advertisers, advertising agencies, and commercial websites, to audit and certify circulation and site-traffic claims of its members. Its annual audit report shows, among other data, the average net-paid-circulation of the print media (daily and weekly editions of newspapers, and magazines) and is used by advertisers in planning their marketing campaigns. Established in 1914 in the US, it has affiliates in most other countries.