A system generates a first user interface that includes a first plurality of items respectively associated with a first plurality of selection functions. Next, the system presents the first user interface to a first user over a communications network. Next, the system receives a first plurality of selections from the first user of a second plurality of items. The second plurality of items have been selected from the first plurality of items by the first user using the first plurality of selection functions. Next, the system generates a second user interface that includes the second plurality of items. The second plurality of items are respectively associated with a second plurality of selection functions. Finally, the system presents the second user interface to the second user.