Nowhere? I suspect few people actually read the report [1]. They asked teen girls (and boys) how Instagram made them feel. The most common response for girls was "no effect" 43%, followed by "somewhat better" 29%, then "somewhat worse" at 18%, then "much better" at 8%, and lastly "much worse" at 3%. The media conspicuously ignored that substantially more girls felt that Instagram made them feel better than worse.

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