A Buy Button technology and service without leaving social media interface already exists through a company called Yapyzal (www.yapyzal.com), created by a major credit card processing company, ePaymentAmerica. They have merchant’s successfully selling directly from their Facebook Pages and have had conversations with many major retail organizations about their patent pending in-stream purchasing technology. They launched in 2013: http://www.businesswire.com/news/home/20130514006363/en#.U8k0t0AXJio