At this point, it's pretty well documented that social media _as a tool_ has increased young female mental illness; the question is only "how much" [1]. To try to wave away responsibility for this by saying "but I'm just making a tool!" is beyond irresponsible at this point; it's morally reprehensible.
[1]: https://jonathanhaidt.substack.com/p/social-media-mental-ill...