I would need more information in order to provide a proper response. However, I believe that there are a number of legal risks associated with such a site. If you have specific questions or issues, I suggest that you speak with an attorney.
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This is a very specific question that deserves a specific answer that can only come after all the information is understood.
I suggest that you consult with a lawyer in private and discuss your objectives in more detail. You can start by calling around to several for a free phone consultation, get some insights then pick the best fit to work with.
DISCLAIMER: this is not intended to be specific legal advice and should not be relied upon as such. No attorney-client relationship is formed with the law firm of Natoli-Lapin, LLC on the basis of this posting.