Now, I am not the sort of person to encourage this, but did you know you can just pop in a name of someone on trademe, and then an email address of something insulting, and its just listed? There is no verification of the trademe accound, none of the email, none of the phone number - they just get listed. So if I wanted to really annoy someone (assuming the site gets popular) I can put a popular trademe sellers name in, and their number, and they would get loads of calls. Emails - same deal.