Operator.com - an iPhone app connecting customers and commerce.
Another big shift in e-commerce is already happening. The question is not "if" but "how soon" it will impact your business.
In case, you were wondering why just check your email. If you use HipChat, earlier today you might have received their newsletter, informing that now you could book Uber ride - through the chat. If you're using other communication apps you already have or will start receiving similar updates soon.