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I think you are onto something - check out NPR community - all is what you would want - truly civil. YouTube and CBC an outrage.

NPR I think set the tone - YT and CBC did no work to create a civic society.

I think that anonymity is a key factor - in Sackville you have to behave because you are known. In a big city......

Design I think can deal with this - BUT - once you let the trolls in...