Abstract: A system for facilitating the purchase and sale of advertising including a server with a non-transient computer readable storage medium. The server is in communication with at least one user device through a network, the user device being configured to receive user input. The server receives from the user device at least one Promotional Avail (PA) which includes a plurality of customizable elements of user input. The display of the user device presents a user interface, which is configured to present information related to the customizable elements in real time. The server is configured to cause to be presented proof-of-performance information to be presented on the user interface in response to a request.