I first read this as a condemnation of phone use, but that may just have been a bias. On a second reading, I found that it was very careful in specifying that a

I first read this as a condemnation of phone use, but that may just have been a bias. On a second reading, I found that it was very careful in specifying that all observations were correlations: >Because this analysis is correlational, we can’t tell if these activities cause happiness, happiness causes teens to engage in these activities more, or if the same type of teens do both. I'd be very interested in seeing a randomized trial to find causations, but the ethical implications get in the way one again.