From a new users perspective I can tell you this much, many of the apps are purpose built for mobile devices and often offer a much nicer user experience than the websites. I find that I visit the same sites from day to day, an app might be viewed as a bookmark with benefits. Speed, presentation are nicer. I'm guessing print and TV media is offering more via apps just to cut out the middle man. Google. This is just my initial perspective, I'm seeing a lot of mobile devices in my stats these days..