This board is like a coffee shop where every conversation is recorded and available to anyone with an internet connection. In this coffee shop, some people wear masks and some don't. As long as the mask-wearers wear the same mask every time they come in, a sense of community can develop and some of the conversations Gord would like to see can happen.
As long as the patrons and the owner react swiftly and consistently to other patrons that come in and display bad behaviour, most of the masked and unmasked patrons will stick around. If the goal is to keep the patrons coming back to the shop, people that shout, call others names or come into the shop and put up false, misleading or vitriolic posters about other patrons would politely be shown the door and not allowed back in.
If there isn't a sense of mutual respect and reciprocity, or the unmasked patrons think those that have been shown the door will be waiting outside to follow them home, then the conversations Gord and others want to have won't happen in this coffee shop.
I'm not sure how this could be implemented online, but the Chatham House rule is useful for people interested in promoting openness and sharing of information in meetings or discussions.