It is not news that we watch a lot of TV in America. Nor is it news that the time spent staring at a smartphone is increasing. But it may be disconcerting that total viewing time is increasing.
And that is the take away from this stacked bar chart. We can quickly see that total viewing time has increased more than one hour over only two years. Smartphone viewing has approximately doubled. Tablet viewing has also approximately doubled, but from a low base.
The main point of the article is that there is a looming battle between smartphones and TV screens for video viewing. This is not really addressed by the chart, only a few numbers in the story. Perhaps an additional chart would have helped.