Operating on-line regional electronic marketplace for sellers of goods and services in which items that are posted by newspaper or broadcast classified ad web sites are made available for sale on the Internet, featuring evaluative feedback and ratings of sellers' goods and services, the value and prices of sellers' goods, buyers' and sellers' performance, delivery and overall trading experience in connection therewith; operating on-line marketplaces for sellers of goods and/or services, featuring the facilitation of classified ad transactions by providing a platform for communication between buyers and sellers of classified ad items via a global computer network