Huge potential market for marketplace whether local or distant selling.

We need to replace Facebook marketplace and craigslist for used physical goods and to do that we need ways to post items, descriptions, photos, location and then be able to filter to find stuff and potentially negotiate (though that can be in DMs vs threads)

But we also need to do this in a way that is preferably privacy preserving (for buyer and seller), and avoids spam and scams with a reputation system.