A subset of graphical display items, in a set of graphical display items stored in the one or more electronic storage devices, that have not previously been viewed by a user is determined. A graphical display item is selected from a subset of graphical display items. The graphical display item may be selected according to an order, or selected randomly. An initial display item and the selected graphical display item are electronically transmitted to a user computing device. The initial display item and the selected graphical display item are configured such that the selected graphical display item is displayed on a display device of the user computing device in response to the user selecting the initial display item when the initial display item is displayed on the display device.