Millennial Media in its mobile ad study for this past April highlighted the mounting problem of getting Android users to pay for apps. Although Google recovered from a dip in March and now represented 53 percent of ad hits on Millennial's network, iOS devices stood for 50 percent of the actual revenue where Android was at 39 percent. iOS ad impressions were growing at a much faster rate as well, at 47 percent since the start of the year where Android grew by 19 percent.
