You know, they can always put in filters i.e. phrases like 'I want to kill myself' etc. get automatically tagged and a helpline number gets shown. A bit like what google has, but the troll problem will still remain.
http://www.myuntoldsecrets.com/View.aspx?secret=102&topi...
(incidentally, I found that site originally via some spamming of the site in the picture, when I was reading the craigslist "best of" linked in it. I see the relevant drop.io page is pointing to another site. :\ )