To me this sounds like post hoc reasoning to justify the conclusion you already want to make. There doesn't appear to be any real correlation between the introduction of Instagram and suicide rates for girls. Suicide rates are up, but it's for both boys and girls and the beginning of the increase predated Instagram.
Instagram is an easy target like Video games, TV, Cell Phones, and Internet were before it. But like those things I don't think there's much causation going on.
Johnathan Haight discusses noticable differences in college students (measurable by mental health services) precisely in the years when students who all had cell phones early [in middle school?] started to enter.
Instagram is an easy target like Video games, TV, Cell Phones, and Internet were before it. But like those things I don't think there's much causation going on.