Regarding selling on FB....
Last month I advertised some worn furniture and a desktop PC that was left behind in my recently acquired condo.
I had to format the PC beforehand but it sold the day after going live with just one enquiry.
Messenger on my phone went berserk with messages for the furniture, which was split into separate adverts: sofa/armchairs, dining table/chairs, sideboard, coffee table etc.
The same day as the advert went live I sold the sideboard to the first person to show up, then an hour later, all the rest to a dealer who collected the next morning. He probably got a good deal but I needed a rest from having to respond to enquiries.
For the ads - Good photos and clear wording etc, all in English.
A farang bought the PC, and all the furniture went to Thais. All paid cash and took the items away.
Similar luck might depend on what you're selling, and how you price it, but furniture seems to be red hot judging by my experience.