Sources
Greg Clayman: RT @shivsingh: Mobile Ad Problem? Not at Twitter, Says Dick Costolo. http://t.co/uVz83NG3Peter 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










