Using Google’s Data to Reach Consumers

Google correlated billions of flu-related Web searches from 2003 to 2008 with actual Centers for Disease Control and Prevention data over the same period. Then, because Web searchers’ Internet addresses indicated location, Google devised a formula to estimate regional flu activity based solely on searches, with a reporting lag of only about a day, outdoing C.D.C. flu reports, which typically are published a week or two after outbreaks. In 2009, researchers from Google and the C.D.C. wrote an article summarizing their findings in the journal Nature, and stated that the new predictive model — now called Google Flu Trends and accessible in an interactive format online — could be a boon to public health. “Up-to-date influenza estimates may enable public health officials and health professionals to better respond to seasonal epidemics,” they wrote. What the researchers probably did not predict was that the Google flu data would end up being the cornerstone of an advertising campaign.