I'm in - sort of started already with 17 sales this month, but I've got a ton more stuff to get shut of.
Today I'm cleaning up an old antique tin box, a fireside, brass plated, tinder box and a guitar for sale.
I can heartily recommend FB marketplace btw - it's quite hit and miss - when someone views the marketplace, they get shown a selection of recent posts depending on what they've searched for recently. After a couple of days, items fall out of this list and the seller needs to renew them (after 7 days) to get them back to the top. You can still SEARCH for specific items and see all those available, but attracting interest in that first 24h makes for quick sales.
You can hide listings from friends, and you can set your FB profile so that everything on it is private - only viewable by friends - then buyers only get to see your profile photo.
You do get a lot of "still available" questions followed by silence, so don't start writing essays in reply until you know there is genuine interest. I usually just reply "yes" and the postcode.
The nice thing about FB is you're in total control. If you don't want to sell to someone because they mess you about, you don't have to. Price-wise, it's worth looking at what things are selling for on ebay, and advertising them on FB for the same.