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Have you tried Facebook Groups? eg. a quick search found a Ham radio group in SD: https://www.facebook.com/groups/856599821517281 . More Ham radio groups in San Diego (you can do a similar search for retro computing): https://www.facebook.com/search/groups?q=ham%20radio&filters... Meetup also has some retro computing groups, though I don't see one in San Diego (why not start one?): https://www.meetup.com/topics/retro…
I'm not going to be the commenter that goes on and on about the negative impact Facebook is having across the world, as this is disruptive to genuine arguments. To give a clear counterpoint to the idea of using Facebook groups - forums had anonymity. You could be a different version of yourself - for better or worse. It's not possible to do that on Facebook without accountability.
Sure it is. Our local town Facebook groups have a wide variety of clear sockpuppet accounts. Facebook's detection and processes for this are laughably bad; quite a few people have reported the "Count von Brokenhymen" style ones to no avail.