User Registration [ ] It is not allowed to register more than one user with the same e-mail [ ] It is not allowed to register a user without an e-mail

TAG Registration [ ] It is not allowed to register more than a TAG with the same name [ ] It is not allowed to register a TAG without a name [ ] It is not allowed the registration by users that aren't administrators

Comments Registration [ ] It is not allowed for an user to register a self compliment [ ] It is not allowed to register a compliment for invalid users [ ] The user must be authenticated in the app