When one of your customers makes a purchase, you purchase the product from a third-party company (the drop shipper, usually a manufacturer or wholesaler) for a lower price. This process is as simple as forwarding the order from your customer, a process that can actually be completely automated. (Remember you don't have any risk here of buying inventory because the sale has already been made).
These businesses may have a Facebook page, but most aren’t getting anything out of it (i.e., they aren’t getting more customers or sales). That’s where you can come in: the Facebook ads specialist. The best part about this home-based business is that learning the art and skill of Facebook ads isn’t impossible — anyone can pick it up and secure their first client within a month.