johnl, I admin an old community FB page for a place we used to live. We've got a few clear and simple rules but nobody likes it when they get applied to them personally, despite agreeing to them when they sign up. One rule is: no for sale ads.
This week someone is angry that we've removed their £435k house for sale advert because they think it's more interesting to the community than other posts we've allowed, and an example he gives is: somebody DONATING BABY FORMULA TO ANYONE IN NEED!