Facebook is full of die hard users. It's surprising the company hasn't added features that compete with Craigslist and eBay until now. Users have sold items on Facebook consistently for years, in groups and on their own pages. They are able to list prices, locations, photos and descriptions of their goods, thanks to a recent addition to Facebook. A new feature will turn your news feed into a shop, where you can view everything that is for sale in your groups or in public groups. You can also search and filter the items.
Just click "All Sale Groups", to the left of your news feed (which is not available for me, right now) and start searching. According to Owen Williams at The Next Web, buying and selling on Facebook is simple. I would agree, and it feels more personal and "friendly" (for lack of a better word). Neither Craigslist nor eBay offer much information on the seller, besides eBay's ratings. On Facebook, it's not uncommon to find a seller with whom you share a friend. I think that makes the transaction more comfortable.
Facebook has said that more features will be available soon. Let's hope there is something in the plans that will allow us to evaluate sellers. One of the key advantages eBay has, over Craiglist, is the rating system. At eBay, you can easily find out how many items a user has sold and what their average feedback score is. Facebook doesn't offer anything that would have the same usefulness right now.
The "all sale groups" page is currently being tested. It may or may not be available when you want to take it for a test drive, but it should be ready to go soon.