Probably an information you already know about as it exists since 2012. But I recently learned about it: the Get On The Shelf Program of Walmart. Walmart indeed leverages the crowdsourcing concept by allowing its customers to select a product that will, as a prize, be listed in Walmart.
It allows Walmart to have a clear feedback on the interest of one product
It implicates its customers in the selection process of the product
It provides a clear opportunity for the supplier, being listed in the most important store network in the world.
This is a great way for a large retailer like Walmart to interact on the social media with its customers.