Greystripe, an ad network for mobile applications and games, has a new report showing how consumers are using free iPhone applications. Among the interesting findings: People use free apps an average of 20 times before getting bored and looking for something else. The average time they spend using/playing with the apps is 9.6 minutes. So-called "tailgate" ads, which are short flash videos or games users interact with before an app launches, are keeping people's attention for about 22 seconds — a positive development in the fledgling mobile ad space.
