1. A method, comprising: determining, among a plurality of media items, a set of media items that belongs to a region on a map, including: selecting, among the plurality of media items, a representative media item of the set of media items; defining the region on the map, a size of the region being dependent at least in part on a size of a reduced resolution image associated with the representative media item; and determining one or more other media items whose corresponding one or more pixel locations on a display are within the region, and including the one or more other media items in the set of media items; and displaying the reduced resolution image of the representative media item in the region on the map to represent the set of media items.