the result, instagram's algorithm suggested they follow pages that promote eating disorders, with names like i have to be thin, eternally starved, and skin and bone. >> what is super tragic is facebook's own research says as these young women begin to consume this eating disorder content they get more and more deblessed and it makes them use the app more. and so they end up in this feedback cycle where they hate their bodies more and more p facebook's own research says it is not just that instagram is dangerous for teenagers, it is distinctly worse than other forms of social media. >> reporter: that's whistleblower frances haugen, who leaked thousands of documents from facebook, including the company's own research, like this. a presentation about the dangers of instagram for teenagers. we make body issues worse for 1 in 3 girls, reads one slide. teens who struggle with mental