Facebook's Marketplace isn't anything new, they tried it before and it may ring a few bells. It died a natural death the first time and if it's to survive this time Facebook need to give the proper support and feature development it needs.
They're off to a good start, Craigslist and Ebay have been around long enough that you either love them or hate them, and those that do hate, usually do so because they don't feel confident that it's a trustworthy marketplace. Facebook's Marketplace addresses this issue by potentially allowing people to look at sellers profiles that have existed for years. At the same time there is something to be said for a little anonymity, after all do you really want everyone on Facebook to know that you're selling the canvas art your partner's mother bought you, that you planned to say broke in the move??
Marketplace ticks a lot of boxes and they have had the time to learn from the mistakes of the past, I can see this becoming a successful revenue stream for Facebook if they continually support and develop it.
Facebook Marketplace lets you browse a relevancy-sorted feed of things to buy from people who live nearby, and quickly list your own stuff for sale. Integration with Facebook Messenger lets you haggle or arrange a meet-up, and you know more about who you’re dealing with than on anonymous sites like Craigslist thanks to Facebook’s profiles.