As the mobile communication devices (read it “cellular phones”) combine GPS technologies with social networking applications, the location information can be incorporated into shared content. For example, your status entries or blog posts can correspond to a position on the map, or even a trail (a longer one if you are on a vehicle). There can be different comments made about a building or scenery by looking it from one side and from other sides.
“Geotagging is the process of adding geographical identification metadata to various media such as photographs, video, websites, or RSS feeds and is a form of geospatial metadata. These data usually consist of latitude and longitude coordinates, though they can also include altitude, bearing, accuracy data, and place names.”
Another application of this technology is an ARG (Alternate Reality Game), in which the mobile devices use the actual coordinates of the player to determine her position on a fictitious universe. Thus, the device acts as a window to the parallel gaming universe. It’s like a treasure hunt except that you are not searching for a concrete object, but expecting your device to “catch” something on the radar. If interested, look at posts on ARG network about GPS technology.