This is a wonderful account of how one person can make a difference - even as young as 17. A high-school senior ended the online bullying in his school simply by creating a twitter account to praise his classmates. He kept his identity secret as he tweeted things like "She is so good at dancing, she gets more scholarships than D1 athletes," about a girl who was attacked by an anonymous account.
One SpeakStrong principle is: Praise in public, correct in private. And it goes without saying, bully nowhere.