You haven't really provided enough information.
Where is the content coming from originally?
If it is user generated content, where else will they be publishing it?
You could use the rel=canonical tag
Unless you're counting on user interaction I would turn comments off and limit what people can post on your site. Why build a site and leave it in the hands of visitors? That's not worth your time at all because of the risk.
Every forum is a website where people post, you don't have to be worried too much about what people publish and about duplicate content, because your traffic will come from user interactions and user experience.
However, every quote on a forum is a duplicate content, so pay attention to the dynamic that a forum in your niche and see what happens with duplicate contents investigating yourself.
I believe the first to got it posted and indexed wins in the eyes of google and all other else are considered dup content. I might by wrong but that's the way it is now
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