Papers 1 and 3 are about correlating _duration_ of FB usage with happiness. Look at the papers referenced here [1] for the same effect as applied to TV. These papers, sans the new controversy over the mental health of young women on Instagram, _don't_ actually point to any stronger of a conclusion than "consuming large amounts of media is correlated with bad mental health".

I'm not saying that FB and this huge corporate capture of the internet is _good_, but making arguments like this doesn't actually make coherent sense.

[1]: https://buddingpsychologists.org/binge-watching-mental-healt... (I didn't read the article, but I did skim the referenced papers)