As pointed out here the Steam group has gone near-silent. I haven't been getting notifications for it and assume others haven't, so I don't really see a way to make it more active without giving it more attention that it deserves.
Our subreddit has gone quiet recently too. We could post updates like we do for Twitter/Facebook there too. As we found in the various surveys, a lot of people use the website, the subreddit and nothing else, so we're missing out on a massive audience if we neglect it.
@Seregon says he'll have more time to work on Thrive come October, and I apologise to him for mentioning it again, but I really think a video (whether casual or formal) outlining the CPA system, posted to our YouTube channel, is a great idea. We could do the same with other game concepts, like a description of the envisaged final microbe editor accompanied by concept art.
And for me personally, I know once I finally finish the Thrive Main Theme and have the approval, I'll upload that to the RG channel too. Whether that will happen soon though I have no clue.
IFTTT is the best bet. We could write a recipe that posts new Facebook content to Twitter, or vice versa, but not at the same time as this would obviously cause an infinite loop. We could even wire in GitHub and the subreddit directly, although a curated approach with actual humans behind everything is in my opinion a better option.
It astounds me how active the Discord server is, and you moderators seem to spend a lot of time managing it. Unfortunately it's only one outlet that most of our audience will never see, so if you and the other moderators are ok with it I'm proposing that you use some of that time and energy to instead manage our social media stuff. That would mean keeping perfect track of development activity both in public and on Slack, but between you it might be possible.