Sources

Greg Clayman: RT @shivsingh: Mobile Ad Problem? Not at Twitter, Says Dick Costolo. http://t.co/uVz83NG3

Peter Kafka: Twitter started selling mobile ads in Feb. Now it makes more $ from mobile than desktop, says @dickc http://t.co/BZYzPPsV

Peter Kafka: RT @allthingsd: Mobile Ad Problem? Not At Twitter, Says Dick Costolo. -by @pkafka http://t.co/JnF7mU9j

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