Hi and welcome to SaleHoo, inthemosh :)
You can sell directly on Facebook, by going to Facebook Marketplace. To learn more please go to Link hidden: Login to view
To check it out and start listing please go to - Link hidden: Login to view
Another option is to visit, Addoway an online marketplace that helps you buy with your friends and merchants you can trust. You can start out with a free account and if you eventually decide to avail of the other perks like their marketing tools, you can sign up for a paid account.
To learn more about Addoway, check out Erika Garnica's blog - Link hidden: Login to view
In my search for more information I found this post with tips on selling on Facebook - Link hidden: Login to view
Hope this helps :) All the best!