I have moved my observations on computing history from SIGCIS to Substack. That site seems to be a much better fit for me than other social media, which I have joined and abandoned over the years (AOL IM, Tumblr, Facebook, Twitter, Instagram, MySpace, Geocities, LinkedIn, and a bunch of others that I have forgotten.).  You might be interested in my latest take on the relations between SIGCIS and SHOT. Comments welcome:

Paul Ceruzzi

Curator Emeritus

National Air and Space Museum

substack.com/@paulceruzzi