Apple's iOS mobile operating system is winning even more ground in mobile advertising market share, according to mobile ad firm Velti. The firm saw Apple's share grow from 59 percent overall to 64 percent between May 2012 and May 2013, with the iPhone 5 grabbing a lot of those new impressions. The iPhone 5's share grew by 7.4 percentage points between May last year and May of 2013, and the iPad added 3.7 percentage points, too, though the iPod touch saw big losses.More...