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There's a closed FB group called Principia Carnivora, which I spent a lot of time on when eating Carnivore.

https://www.facebook.com/groups/PrincipiaCarnivora/

Or even better, I just spotted a new one by one of the early adopters - for The Paleolithic Ketogenic Diet, which supports people who eat organ meats. Not all of the original group are keen on those.

https://www.facebook.com/groups/618857368553023/