I imagine eBay can't be far behind (unless they have to negotiate patents etc.)
Online shopping site Buy.com said on Tuesday it has launched a new shopping service named Garage Sale for users of online social networking sites such as Facebook.com.
With the new service -- which allows users to bypass online auction and sales sites and to sell goods directly from a profile page -- Buy.com hopes to attract business away from larger rival eBay Inc.
Buy.com launches Garage Sale service on Facebook - Yahoo! News