For all I know, what she did is illegal. But I'm glad she did it, it was very brave and she puts herself at a lot of risk by doing it. If Facebook goes after her, they will undoubtedly get bad press and encourage government regulation and possibly even antitrust action.
Facebook and other social media aren't inherently bad, but the incentives are certainly there for them to amplify the worst of human nature. This is most likely a problem that needs people outside of Facebook (and all these other companies) to solve. I am 100% in agreement with her that it is a solvable problem.