The anecodte the poster gives is spot on and huge. There have been many times I've thought "I wonder why I don't hear from this person anymore" and it was simply a matter of Facebook no longer prioritizing their posts in my news feed.

Just because someones post isn't "liked" or clicked on in some way doesn't mean it's not valuable. It's a passive form of communication.

I don't know if this is just my perception, and maybe Facebook doesn't prioritize things in the news feed. Regardless, it's a UX question that needs to be asked by their team.