1. A method comprising: by one or more computing devices, receiving via a communications network an item of digital media and tag data associated with the item of digital media from a first user, the tag data defining a bounded two-dimensional region surrounding a particular feature within the item of digital media and associating a first tag with the bounded two-dimensional region; by the one or more computing devices, receiving via the communications network an input from a second user selecting the item of digital media; by the one or more computing devices, accessing the item of digital media and the tag data; and by the one or more computing devices, providing via the communications network for presentation to the second user a graphical user interface comprising the item of digital media and a tag list separate from the item of digital media, the tag list comprising the first tag and a second tag, and the graphical user interface being configured to: provide a visual or graphical indication, within the item of digital media, of the bounded two-dimensional region associated with the first tag by the tag data in response to user interaction with the first tag in the tag list; and suppress the visual or graphical indication of the bounded two-dimensional region associated with the first tag in response to user interaction with the second tag in the tag list.