How Do They Track You? Let Us Count the Ways

In my article in Monday’s Times, “To Aim Ads, Web Is Keeping Closer Eye on What You Click,” I worked with comScore to develop a new measure for Web companies: how much data they can collect from users.

On the Internet, companies are typically ranked by how many different people visit their sites in a given month. And when Microsoft announced its $41 billion bid for Yahoo, comScore and Nielsen Online promptly put out estimates counting how many people would be in the merged company’s total audience.

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This is a section of the AllThingsD Web site featuring posts that have been curated from around the Web: pieces we’ve read, discussions we’ve followed, stuff we like. Five posts are included here each weekday, but only the headline and the first two sentences. We link to the original site for the rest. The section is explicitly labeled, so it’s clear that content comes “from other Web sites.”

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