Smart phones are here to stay, having quickly grown from a status symbol to a vital part of modern daily life. In 2014, Nielsen—the same company that has tracked TV viewing for decades—took an in-depth look at consumer usage of mobile apps. They found that while the number of apps used by American adults remained flat, at just under 27, the number of hours spent on those apps jumped by 65 percent in just two years. The average American adult now spends more than 30 hours per month using mobile apps.
