Perhaps the managers of the site can consider something like that. It sometimes even helps to say to a defaulter that you are going to list him on the internet for whatever it is that he is defaulting on. So if it can be organised (say according to areas, etc.) it may be very useful. One can then add contractors that you have used and has given great service, but if someone else is not happy with the way they got treated, they can comment. Something like that....
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