Displaying messages on created collections of displays

Collections of displays are created from a number of displays, based on display attributes of each display, to yield display collection attributes for each collection. It is determined whether any of a number of messages should be displayed on any of the collections of displays, based at least on message attributes of each message and on the display collection attributes of each collection. Where it has been determined that a given message should be displayed on a given collection of displays, at least a portion of the given message is transmitted to each display within the given collection to display the given message on the given collection of displays. The displays may be movable displays on vehicles and that are functional while the vehicles are moving, billboard displays on billboards along a road, stationary displays on buildings within a given location, or other types of displays.