In my experience actual management posting on a forum is rare and often goes poorly. (To the point that sometimes the first post is the last.)
As for reading, who knows? At a previous employer, I used to read a forum about us, mostly for entertainment. If I brought it up in a meeting, most people were pretty dismissive. Marketing and management would tell me that’s not a good way to get consumer data – too much self-selection bias etc.
Banned but back. Because why not?
