This storefront application is free and is in beta.
Payvment :: Social Network eCommerce
Here are some of the features of the site
Enable storefront wide instant discount for those who "Like" your Facebook page. A great incentive for Facebook users to become "Fans" of your page!
Store/Item "Share" feature enables Facebook users to tell all their Facebook friends about an item they like in your store via their Facebook news feed. Includes a link back to your Facebook store
Built-in review/commenting integration enables Facebook users to leave a comment about an item in your store and post it to their Facebook news feed.
I don't know if this has been posted before but thought it would be a good share. Unless you live on the forum, great things will pass by quickly. I would believe that if used properly this would be a very valuable and profitable selling tool.