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A while back I had the same problem you're facing now at my site SFFPC.NL
I decided to go PHP Wiki for FAQs, so everybody can contribute to the content (you can decide if they have to be members or not).
And another advantage of wiki based solution is you have a diff function so you can most of the time go back to an old version. So you don't need to approve anything (which I think is something you don't want to do because it uses huge amounts of time which you can invest more useful in site development).