The only parts of Facebook that I still use are the marketplace and Buy Nothing groups. To my knowledge, there’s no better place to get rid of stuff that you own in a responsible way that provides use for someone else. I’ve probably sold or given away over 100 items in the last 7 years.
My most memorable interaction happened when I lived in Athens, Georgia. I had listed 10 or so items at the same time during a purge / cleaning. A man had messaged me about two different items: a portable speaker and some other item. When he realized I was the same seller, he said, “what else ya got” and proceeded to buy at least 5 of the items I was selling including a fuzzy blanket.