Facebook Buy Button Test

In Retailwire:  Will people buy directly on Facebook?  Possibly, but I have never see FB as a commercial context.   A test is underway.  " ... Users on desktop or mobile will be able to click the Buy call-to-action button on ads and Page posts to purchase a product directly from a business without leaving Facebook. How appealing do you expect Facebook's "Buy" button will be to Facebook users?  ... "