Even though we are granted freedom of speech through the first amendment, I feel like the app is allowing people to intentionally bully without fears of being reprimanded. I can easily go on and mention something about another person or participate in acts that could get me expelled from my university. It's designed for college students, but it's possible that someone can go onto it after an examination and post test questions (and/or answers) and not worry about being found out and punished.
There needs to be something added internally to help prevent users from abusing it. Even doing something as simple as allowing the app to access some sort of personal identification such as that cell phone number or requiring users link it to a facebook/twitter account (can easily be added into the ToS so no legal issues can arise) to their account information (not displayed when communicating through the app) will guarantee that people will be punished if they use the app to do something illegally.