Facebook marketplace is a social classifieds service on Facebook that allows users to find classifieds in their area. This can be a great way to promote your products and services if done correctly. Using the Facebook Marketplace you can sell, give away, buy, ask or search for anything you want. You can also use the Marketplace to support your favourite charities by selling your unwanted goods for a good cause. Additionally, you can see what your friends are buying and/or selling.
Here is a simple guideline on how to make listing on dummies.com/how-to/content/how-to-post-a-listing-in-the-facebook-marketplace.html