Great discussion here already. I want to bring attention to a bit of additional research relevant here which I found to be a good read and was conveniently not mentioned by Facebook: a 10 year, 500 participant longitudinal study on social media use and suicide in teens. Published Feb 2021.

link: https://link.springer.com/article/10.1007%2Fs10964-020-01389...

Even if we take fb word for it that the WSJ's interpretation of data from fbs study was not generous, I would like them to respond to the critical external research too. Fbs study has 40 participants who were directly asked their opinion about the causality of using Instagram and their well-being (no chance that a harmful addiction would be coloring their perception on that!). So, let's look at the longitudinal data also, fb.