Do you not see the difference between “my teenager is moody” and “depression”? Using minimizing language here helps no one.
I agree that there should be more formal research into the effects of social media but as a parent I see concern about the effects of social media in conversation with other parents and teachers all the time. It is something we all witness in our own lives to some extent or another.
“We should let this run rampant while we investigate it fully” and “we should block this while we investigate it fully” are both valid viewpoints. And if voters want the latter it only makes sense for the government to be responsive to that.
It's very hard, maybe impossible, to answer the question of whether social media harms people. It's like asking if TV, video games, etc harm people. Maybe -- but I don't trust the studies and at any rate, these are things people should decide for themselves and their families.