As one example, a system for facilitating a market for channels is provided that enable access to Internet users. The system comprises a channel server including multiple channels, each of which are defined at least in part by an activity profile associated with the channel, where for at least one of the channels, the associated activity profile is satisfiable by a client based upon interaction of the client with multiple different independent websites; a search interface configured to receive an input query and return one or more of the channels as search results in response to the input query; and a channel tool configured to enable portions of the search results to be selected and used to implement a desired channel.