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How they know what you like before you do

The high-tech tracking of people's preferences puts firms in touch with tastes.

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The other night, a few friends sat in Tracey Kennedy's Rock Island, Ill., living room listening to music. A song by a band no one but Ms. Kennedy knew started to play, and everyone wanted to know who it was.

Kennedy revealed that it was Silversun Pickups, an under-the-radar Los Angeles band she'd found using an Internet music service called For her, the website's personalized music recommendations have sparked new listening habits. "It's like I've come back to life," says Kennedy, a 30-something computer programmer. "I'm getting all these vitamins I need." Since she started listening to Pandora at work in late October, Kennedy has bought about 35 new albums.

That's music to the ears of those who make recommendation technology. By 2010, one-quarter of online music sales will be driven by such "taste-sharing applications," predicts a study released in December by the Berkman Center for Internet and Society at Harvard Law School and research firm Gartner.

Over the past decade, e-commerce has taken a cue from the notion that friends give the best recommendations. Personalized suggestions have become more commonplace as various forms of media converge, industry professionals say, and this could both change the entertainment industry and give consumers more power.

What started with's "collaborative filtering" approach, which made product suggestions to consumers based on what they bought, has become a more precise science.

Kurt Beyer, president of Riptopia, a digital media processing company, divides recommendation technology into two general schools: theoretical and empirical. The theoretical approach bases its recommendations on qualities inherent in a product. The empirical approach is similar to what does, gathering large amounts of data about the buyers of a product to make recommendations based on demographics and interests.

Recommendation technology is "exploding," claims Daren Gill, vice president of ChoiceStream, a Cambridge, Mass., company that powers recommendations for AOL, Yahoo Movies, and eMusic, among others.


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