Driving external traffic from social media (in this case Facebook) is one of the most effective ways to increase product sales while controlling more of the sales funnel. Building a sales funnel, fed by Facebook traffic towards your Amazon detail page is an excellent way to increase product visibility.
Sending external traffic to your Amazon detail page, without the landing page in between, can be a huge budget suck and a total waste of time. Why? The lack of an offer. The most effective sales funnel includes an offer. In this case, a coupon code can increase conversion rate astronomically.