We do quite a bit of segmentation. The platform lets us segment by product interest - since we have 18 or so products listed on the same community platform (and they all have their own forum/event/resource/blog pages).
From there we can segment further. I break my community down by job role (marketing/events/database admins/membership etc). I send them topics and resources that are relevant to their field. I always see an uptick in engagement when these go out. If I message them as a group, I let them know it’s because someone else in their field needs advice. They are generally keen to help each other.
It does allow us to segment based on actions as well, so we could message our most active posters, or those who have clicked on a certain resource, or just most active in the space. It’s a missed opportunity that I haven’t done anything with those options yet!