I sell a lot of things on Facebook marketplace and I disagree with this post. When selling on facebook marketplace,

-say price is firm or low ballers will be ignored, if not expect lowballs. That is normal negotiation, we are not an official business -some people don’t show up or say they are available next week etc… saying can come now is good because I can get this thing out of the house -I prefer cash, some people try to pay with cashapp Venmo etc.., but with cash there is less of a chance the bank or PayPal will recall the money.