I used to be on a forum with only half a dozen people, someone in the group hosted it. We wanted to share images so someone wrote and hosted a pubic file sharing site...

We never shared the link to the uploader publicly, yet within a couple of weeks the URL was out there somehow and he was getting all manners of horrific stuff uploaded to it, he had to close it down just to protect himself.

You've posted this to HN.

I wouldn't take this risk.