So, how is Marketplace better than eBay or Craigslist? Facebook says "you can feel good about buying and selling on Marketplace" since you can check out a seller's or a buyer's profile, see if you have any mutual friends and how old their accounts are. In an ideal world, that means you won't ever have to worry about getting scammed (or, you know, raped and murdered) during a meetup. It's still a young feature, though, so you might not always find what you need there and will probably still have to regularly visit its competitors.