A year ago, in the run-up to its IPO, Facebook told the ad world that it had a new plan: “Sponsored stories” — ads that looked like “real” content, that would show up on users’ screens based on the way they and their friends behaved on Facebook. New new plan: Facebook will let advertisers buy ads on the social network the way they buy ads all over the Web — tracking users’ travels outside of Facebook, and showing them ads based on their browsing history. Facebook...
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