Here is a terrific site to get informed ...
Regain your name | Reputation management | Delete cyberbullying and defamation | Online image repair

Twitter account for EndCyberBullying ...
@StopWebBullying

These sources will lead you to more support(s). Bullying is NOT ACCEPTABLE on a global basis!!!!

If you feel comfortable, send me a pm here at PC with the Tumblr account of the person you are worried about. You are correct, inadequaeJellyfish, enough is enough in regards to bullying. Bravo you are taking a stand !!!

Keep in mind too that Facebook, Twitter, and Tumblr are stepping up their measures to stop bullying on their platforms.