"SAN FRANCISCO--When it comes to search quality, Google has a split personality.
Google uses a method called split A/B testing to measure exactly what changes it should make to its main search Web site--both to its famously Spartan search box and to the results it produces. With the approach, Google shows different versions of the pages to users and measures how they respond, said Marissa Mayer, vice president of search products and user experience, in a speech at the Google I/O conference here Thursday."
We're all guinea pigs in Google's search experiment
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