Koizumi was not rooted in Japan's rightwing nationalist tradition: he was a pragmatist and a populist. Abe, in contrast, is a rightwing nationalist. Unlike Koizumi, for example, he has questioned the validity of the postwar Tokyo trials of Japan's wartime leaders, which found many of them guilty of war crimes.
WhatsApp provides phone-number-based messaging, and people asked, 'Isn't that what SMS is?' Yes, but SMS is expensive, antiquated, and what WhatsApp did was modernize and level that playing field. For example, in Europe, if France wants to talk to Belgium, it's extraordinary costly because of border and telecom charges.