Thank you for posting to the seller forums.
Just recently, we introduced social promo codes, which are easy to share on social media and give a percent discount to customers on eligible products at checkout. Once you create a social promo code, you will receive a URL for the unique landing page that contains a list of the qualified products for the promotion as well as the promotion details. Customers can add items to their cart directly from this landing page, and the discount will automatically apply.
Sellers on the Professional Selling plan will see this option available to them from >Advertising >Promotions >Create Promotion, selecting “Social Promo Code.”