Mobile ad spending has been growing over the past couple of years up from $416 million in 2009 to $743 million in 2010. Still, despite an estimated spending increase of 48 percent to $1.1 billion in 2011, there are still some lingering issues.

But right now money is flowing into mobile because advertisers have learned to fish where the fish are, writes Mike Chapman. Not because of the potential offered by tiny, precision-targeted, web-connected, location-aware ads.

Indeed, a third of mobile advertising targets by reading rich media support; only 15 percent use location and the same amount by handset model and age and country are used less than 10 percent each.

Another interesting statistic shows that Android makes up the largest share of ads served at nearly 40 percent, with iOS seeing 30 percent and Blackberry at 25 percent. Still, iOS has double the click-through rate with 0.8 percent compared to 0.4 percent for Android and Blackberry.

Source: AdWeek