>internal research showed that the app exacerbated mental health issues for teen girls in particular.

This is twisting the truth.

Specifically FB had found that for teenage girls with body image issues the ones they surveyed on average thought Instagram on average made it worse. 31% said worse, 22% said better, and 45.5% said it had no impact. For the other 11 other mental health issues they said Instagram made it better on average. For teen boys for 12 out of 12 mental health issues they said Instagram made it better.

https://about.fb.com/wp-content/uploads/2021/09/Instagram-Te...