Jonathan Mayer had a hunch.
The young computer scientist suspected that online advertisers might be following consumers around the web — even when they set their browsers to block the snippets of tracking code called cookies. If Mayer’s instinct was right, advertisers were eying people as they moved from one website to another even though their browsers were configured to prevent this sort of digital shadowing. Working long hours at his office, Mayer ran a series of clever tests in which he purchased ads that acted as sniffers for the sort of unauthorized cookies he was looking for. He hit the jackpot, unearthing one of the biggest privacy scandals of the past year: Google was secretly planting cookies on a vast number of iPhone browsers. Mayer thinks millions of iPhones were targeted by Google.
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