Why Google will crush Nielsen | Technology | guardian.co.uk
The developing field of statistical pairing technology shows great promise. It is now possible to pinpoint a single user browsing the web with different devices in a very reliable manner. Say you use the four devices mentioned earlier: a tablet in the morning and the evening; a smartphone for occasional updates on the move, and two PCs (a desktop at the office and a laptop elsewhere). Now, each time you visit a new site, an audience analytics company drops a cookie that will record every move on every site, from each of your devices. Chances are your browsing patterns will be stable (basically your favorite media diet, plus or minus some services that are better fitted for a mobile device.) Not only your browsing profile is determined from your navigation on a given site, but it is also quite easy to know which sites you have been to before the one that is currently monitored, adding further precision to the measurement.
Over time, your digital fingerprint will become more and more precise. Until then, the set of four cookies is independent from each other. But the analytics firm compiles all the patterns in single place. By data-mining them, analysts will determine the probability that a cookie dropped in a mobile application, a desktop browser or a mobile web site belongs to the same individual. That’s how multiple pairing works. (To get more details on the technical and mathematical side of it, you can read this paper by the founder of Drawbridge Inc.) I recently discussed these techniques with several engineers both in France and in the US. All were quite confident that such fingerprinting is do-able and that it could be the best way to accurately measure internet usage across different platforms.
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