I would say it's about as popular among the gamers at Meta as it is among gamers outside the company. I play it myself periodically, but I wasn't even aware that Mark was a fan of the game, and I've been here a long time.

I remember him commenting at a Friday AMA about it when Civ 6 came out, which was a long time ago.

Oddly, Civ seems to be very very popular amongst data scientists. I have no idea why.