Design, development, programming, installation, and maintenance of computer network software for tracking of user web activity and the transmission targeting and delivery of online advertising via a variety of media and devices; providing online software for the transmission, targeting, and delivery of multimedia content via a variety of media and devices; promoting the goods and services of others by preparing and placing advertisements on pages accessible via a variety of media and devices; advertising services comprised of a network of web sites that collect and use web user demographic information to target the delivery of relevant marketing and advertising materials to users; providing for the sale and purchase of direct response and e-commerce advertising space on an on-line electronic network; computer hardware, computer software, and telecommunications products relating to the provision of online advertising services and online marketing and market research services