Advertising, including promotion relating to the sale of articles and services for third parties by the transmission of advertising material and the dissemination of advertising messages on computer networks; Auction management services provided to others over an on-line web site accessed through a global computer network; Auctioning via telecommunication networks; Cooperative advertising and marketing services by way of solicitation, customer service and providing marketing information via websites on a global computer network; Matching consumers with real estate professionals in the field of real estate services via computer network; On-line advertising and marketing services; On-line advertising on computer communication networks; Online business networking services; Operating on-line marketplaces for sellers of goods and/or services; Promoting the goods and services of others via a global computer network; Promoting, advertising and marketing of the on-line websites of others; Providing a web site which features advertisements for the goods and services of others on a global computer network