The official website of Facebook is only a page which is not for direct selling. It is mainly for promoting brands and attracting customers.
The products in the store enables you to share products with their fans.
The stores can set promotion activities anytime for fans.
The stores have special hint button for the products checking by which we can standard the custoemrs who are really interested in the goods to follow the steps of clicking the button firstly and then checking the pages. Increase the store ranking result in Facebook in another way because the number of likes is an important standard for it.
A professional shop show directly the product information to the buyers and they should frequently update the pages to increase rank by adding fans. Enable more potential buyers find the shop. And the company official website can't do this.