When people talk about f-commerce (Facebook enhanced retail) what typically comes in mind is the f-store, the Facebook store. But f-commerce is bigger than f-stores. With the launch in 2010 of the Facebook Open Graph Protocol, along with social plugins - brands and retailers have been able to offer Facebook-enhanced retail on websites and in-store, creating a triumvirate of f-commerce opportunities. Notable examples in the two following links.
F-commerce on Facebook & On-site F-Commerce & In-store F-Commerce
Source: Social Commerce Today