AdWords helped revolutionize online advertising, offering marketers the chance to bid to display their ads when people searched for certain keywords on the Google searchengine.
Google's Flu Trends, which monitors millions of queries submitted to the giant searchenginefor the occurrence of flu-related keywords, is at best contemporaneous with an outbreak.
There are as many web pages for advertisers as there are keywords that can be typed into a searchengine, situations that game players might find themselves in, and so forth.