When you’re looking to sell inventory online — whether it’s old stock or new products — your options are no longer limited. Facebook Marketplace is often the first option that comes to mind today, but there are other online marketplaces you should still consider. The universe of online sales sites has evolved into a constellation of platforms, each catering to a different need, niche or neighborhood.What is Facebook Marketplace?Facebook Marketplace describes itself as “an e-commerce platform that connects sellers and buyers through meaningful interactions and unique goods.” Its core strengths are its “free to use” price tag and its national and local reach and integration with Facebook Messenger, through which buyers and sellers can arrange for pickup, ask questions or negotiate on price.Each sale on Facebook Marketplace is connected to a Facebook account, giving buyers and sellers — of products as diverse as furniture, vehicles and restaurant supplies — a level of safety by providing…