look at the end of the original link http://metrics.admob.com/2010/06/may-2010-mobile-metrics-report/ http://metrics.admob.com/2010/06/may-2010-mobile-metrics-r

look at the end of the original link http://metrics.admob.com/2010/06/may-2010-mobile-metrics-report/ http://metrics.admob.com/2010/06/may-2010-mobile-metrics-rep... Generated by "Harsh S" AdMob Marketing this explains everything