Craig's list is an online social market place of sorts. It's very simple, with no fancy formatting or design. Yet it's widely used, all over the world. It seems the majority of its use is by everyday people offering products (mostly used) or services themselves, as individuals or small businesses. It's easy to set up an account, and you'll need to read or notice some of the limitations in posting.
Craig's list is not monitored, so as always, user beware.