I would say more that this effect is more well studied on US teens so we can say more conclusive things on US teens. In addition, there is some indication that the effect could also be present in non-US teens and should be further studied.
That makes putting it on social media alone much more tenuous, though.
This reminds me of similar effects where people attributed misinformation online to mostly right wing people, but it was actually right wing was only a catalyst when a predisponsity for chaos was also present OR when de-policing and federal investigations were blamed for rise in crime when it was only also when a particular district had a "viral" event.
I don't think social media is a causal factor in itself, but it is definitely a catalyst factor in the presence of other things like wealth inequality, clout chasing, and cyberbullying.
