42 Computer services, namely, providing demand-side platform servers to others; Developing and hosting a server on a global computer network for the purpose of facilitating e-commerce via such a server; Providing customized computer searching services, namely, searching and retrieving information at the customer's specific request via global computer networks; Computer services, namely, providing search platforms to allow users to develop online advertising campaigns, buying online advertising inventory and/or purchasing online advertising space; Computer services, namely, interactive hosting services which allow the users to publish and share their own content and advertising on-line; Computer services, namely, providing search engines for obtaining advertising inventory on a global computer network; Computer services, namely, creating an on-line virtual environment for buying online advertising inventory and/or space; Platform as a service (PAAS) featuring computer software platforms for buying online advertising inventory and/or space and developing and running campaigns; Computer services, namely, hosting an interactive web site that allows development of custom advertising campaigns