I used to be on the forums at zombiehunters.org quite a bit. There is an offshoot that was created and populated by some former members there when ZS management decided to shut their forums down, and I'll be happy to share that by PM if anyone is interested.

I spend a lot of time on reddit, and as I have added amateur radio to my repertoire over the past year I'm spending time on related Discord servers and other resources for that community.

There are meatspace venues for different local organizations that are part of my community-building as well. That is one of my main focuses for preparing for the unexpected; having people around to help and in turned to be helped by.