https://www.reuters.com/article/usa-congress-facebook-instagram/under-criticism-facebook-to-highlight-own-positive-research-on-instagram-and-teens-idUSKBN2GP2GS >(Reuters) -Facebook Inc, under criticism over internal data showing its Instagram app damaged the mental health of teenagers, plans to highlight during a U.S. Senate hearing on Thursday what it argues were more positive impacts, according to the company's prepared testimony seen by Reuters.