Watch out, Craigslist -- Facebook's newest feature is looking to change how people buy and sell their stuff.

Facebook started rolling out Marketplace for its Android and iPhone apps Monday.

The feature is mostly self-explanatory: Marketplace lets users browse a feed of items that people nearby are trying to sell, or users can list their personal items for sale.

From there, users can send a direct message through Marketplace to arrange a meet-up or negotiate prices. And, thanks to Facebook's profiles, users know more about who they're dealing with than with other sales sites.

There are some some safety and privacy rules that come with Marketplace. For example, Facebook doesn't allow the sales of firearms, alcohol, animals or drugs, among other things.