WHEN he is not lifting minuscule weights or catering to the whims of his cats, Najib Razak somehow finds time to be Malaysia's prime minister-or so his feed on Instagram, a photo-sharing app, implies. Hun Sen, Cambodia's strongman, apparently dedicates most of his time to posing for selfies with adoring young Cambodians, if his Facebook page is to be believed. And then there is Narendra Modi, India's prime minister, who assures his followers on Instagram: "Every moment of my life is devoted to the welfare of India." That cannot be quite true, as quite a lot of it is devoted to social media, most notably Twitter. He has tweeted more than five times a day, on average, since joining the microblogging service in 2009. He has more than 40m followers, just 7.5m behind Donald Trump, and over 33m more than the combined following of Emmanuel Macron, France's president, and Justin Trudeau, Canada's prime minister.
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