According to a survey published in mobile advertising firm AdMob’s January Mobile Metrics Report (PDF Link), iPod touch users download more apps and spend more time using apps than iPhone or Android users. The report states that iPod touch users download an average of 12 apps per month, 37% more than iPhone and Android users, and spend an average of 100 minutes a day using apps, 25% more time than iPhone and Android users. iPod touch users are…