At the time of writing, “digital marketing” is the increasingly accepted term for the marketing and selling of products and services through a range of new, rapidly integrating, technologies like mobile telephony and, of course, the internet. It is yet another vast subject which is difficult to capture in this format. It is also fast changing, so it is difficult to come to effective, professional judgement on developments in it. At the time of writing, for instance, Twitter has become a major phenomenon in many Western counties.(