Geocoding in Action

I have noticed that Facebook is on the chief "Geocoders" on the web today. Everytime you log into you profile you get advertisements from local business and activities. In fact you even get advertisements based on your own certain demographics. For instance, I get alot of military advertisements becuase I in the United States Air Force network and therefore I am targeted with adds in accordance with this. Perhaps this is why facebook is so valuable to marketing companies as it has essentially has so much market research already complete for advertisers.