I answer on AskHistorians, but don't post there. But I'd love to see activity there too! Mostly I run three history meme communities (HistoryMemes, RoughRomanMemes, and ShermanPosting), and four communities for sharing historical images of interest (HistoryPorn [not my choice of name, it's just for photos], HistoryIllustrations, HistoryRuins, and HistoryArtifacts)
No, I'm part metal. Helps to keep going longer than mere organics, but getting through the airport is a bitch.
More seriously, I take 2-4 times a day to grab some pics from my stashes and post them real quick on my regular communities. Takes maybe 15 minutes each time. 60 minutes every day is a good chunk, but it's far from grueling.
Now, my FOMO causing me to check my notifications every moment I get free time? That's a little more grotesque.