Microsoft, AOL, and Yahoo have agreed to begin selling remnant, or "class two," inventory on each other's sites, Peter Kafka reports. "The theory," says Kafka, "is that if, say, AOL has a big order for a certain kind of ad impressions, it will fill it with its own inventory as well as what’s available from Microsoft and Yahoo."
Yahoo!, Microsoft, and AOL announce huge ad partnership
Twitter expanding promoted tweets
Android gobbles BB share to take top spot in US smart phones
Problems at Groupon’s China JV
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