Providing direct access to advertising inventory suppliers via an online marketplace; provision of an online marketplace for buyers and sellers of digital advertising inventory; mediation of advertising; rental and sales of advertising space on the internet; online advertising network matching services for connecting advertisers to websites; providing advertising and marketing services for facilitating buying and selling advertising space; providing online searchable databases in the field of advertising space; advertising services, namely, placement and dissemination of advertising for others via an on-line communications network; business marketing, promotions, and advertising consulting services; providing advertising campaign management services in the nature of tracking, analyzing, and reporting on consumer data, demographics, and consumer behavioral information, computer network use and users for business purposes, and consumer responses to advertisements and promotional materials; management and compilation of computerized databases, namely, creating and managing customer lists and customer data in a computer database for others; conducting market research and consumer research; advertising research services; advertising by transmission of online publicity for third parties through electronic communications networks; advertising via electronic media and specifically the internet; dissemination of advertising for others via the internet; media research services, namely, providing an Internet-based database in the field of consumer audience viewership, advertising sales effectiveness, and selection of media to optimize sales results