Social recommendation website DoTogether launched its Facebook mail application. The application providers users the ability to browser several stores, making the shopping experience easier - consider the app a meta-recommendation engine for Facebook.
According to the release: "By utilizing DoTogether.com’s online platform as a social media marketing tool, retailers can connect with both their customers and their customer’s friends. In addition, retailers can advertise discounts and promotions to a wider audience at a low cost. Not only can retailers engage customers before they make a purchase, but retailers can obtain analytics about the conversations regarding their products and brand."
Definitely something to look into if you're an Internet retailer interested in capitalizing on Facebook's phenomenal engagement metrics.