Here, o scoundrel, is an archive of the Blades in the Dark Google+ community. It lived from Feb 24, 2015 to April 1, 2019. This archive includes every post that was active at the end. I’ve done my best to preserve the original authorship and content of each post and comment, though there are doubtlessly things that have been lost (especially links to other G+ posts and editable Google Docs).
Scoundrels continue to talk about Blades in the Dark and its offshoots here: