There can be no denying teenage reliance on their portable devices and Online Degrees.org provides a nice infographic on how college students are using their smartphones.
The dominant activity appears to be communication, although no data is presented on social media use.
If “idle time” is dominanted by smartphone use, is it still idle time?
I’ve just finished gathering data from a survey of high school students enrolled in elearning courses, on how they use their cell phones–there are some amazing results. Look for it in the future!