A lot has been made of Twitter’s alleged advantage in the mobile space, notably when it comes to advertising success. Last month Twitter CEO Dick Costolo waxed lyrical about his company’s edge over Facebook when it came to mobile ads, explaining that because Twitter was “borne of mobile”, they had an ad platform that was “inherently suited to mobile”.

Well, perhaps not, as a new report has unveiled some surprising data on Facebook’s position in the mobile ad space – not only is the social network earning more from its ads, but its mobile advertising is outperforming Twitter by four to one.

(Well, that’s how it looked initially. See further below for a July 20 update to this story. The rest of my piece has been left intact.)

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