Thx @Stephen, I respect the idea that we could promote the about the category post, but what we’d love to do is promote the topic list of a category, where new users could see the dynamism of the contributions by our community. Linking to a static post wouldn’t convey the experience that our site offers.
Unless I’m missing something, it sounds like having an ability to set an og:image for the category is not currently possible, and I’d like to see if it can be considered as an enhancement.
I would be happy if it could just pull the same og:image from the about the category post… that could be a fine way to manage it without having to add more settings to the category editor.