Online Ads Can Now Follow You Home

Advertisers already know what people are up to on their personal computers. But understanding their online whereabouts on smartphones or tablets has remained elusive.

A number of companies are trying to better pinpoint mobile users’ online activity with new software and techniques they say could help advertisers track users across devices.

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About Voices

Along with original content and posts from across the Dow Jones network, this section of AllThingsD includes Must-Reads From Other Websites — pieces we’ve read, discussions we’ve followed, stuff we like. Six posts from external sites are included here each weekday, but we only run the headlines. We link to the original sites for the rest. These posts are explicitly labeled, so it’s clear that the content comes from other websites, and for clarity’s sake, all outside posts run against a pink background.

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