Facebook is home to over 350,000 other applications and they were created by third-party developers across the world. With so many apps Facebook provides a great opportunity to use them for better eBay and Amazon business. Almost every online business has claimed a Facebook fan page. You can integrate your fan page with your website/blog and then integrate your website/blog with your fan page. So, you can use Facebook to get traffic to your website and then direct it to your web store.