If you've got a smartphone, it's increasingly likely that you're also carrying a tablet as a sidearm. ComScore understands that 23.6 percent of American smartphone owners also have an iPad, Kindle Fire or some other large touchscreen slab as of April. That's only 16.5 percent of all cellphone owners in the land, but that's a huge jump from 9.7 percent of smartphone owners (4.7 percent of cellphone owners) just one year earlier. And if you do own a slate, odds are that you're watching your fair share of
