Although perhaps more importantly that constant exposure to emotional bias can put that bias in you. There was a much less credible study of whether or not watching Fox News made you more conservative (the unspoken threat there was that watching any consistently biased narrative would align you to that narrative) but the Facebook study has better statistics.

So one wonders if all the kids programming is consistently biased towards some topic, will it bias that generation? Sort of a weird inception sort of hypothesis.

For me it just confirmed my own experience that being around people who are sad makes me feel sad (not sure if I'm sad for them or me, but what ever) and so being optimistic around people might keep them going. But again not a lot of science there.