This is one way to look at it but we know what’s driving the bulk of mobile ads– it’s mobile app install ads. There may be other ratios that may be more helpful or interesting than this one.
What it shows is that while Twitter occupies a tiny fraction of the time people spend on their smartphones, it generates an outsized amount of revenue while people are there. Twitter produced nearly 10 times more money per user per minute than Facebook and nearly five times as much as Google in the fourth quarter.
If you look at several tech companies’ ability to monetize users minute by minute, Twitter far outpaces the competition. It leaves a lot of room for Facebook and Google to improve their effectiveness in mobile advertising.