For all the benefits that WhatsApp offers in helping people feel close to others, its rapid ascendency is one further sign of how a common public world - based upon verified facts and recognised procedures - is disintegrating. WhatsApp is well equipped to support communications on the margins of institutions and public discussion: backbenchers plotting coups, parents gossipping about teachers, friends sharing edgy memes, journalists circulating rumours, family members forwarding on unofficial medical advice. A society that only speaks honestly on the margins like this will find it harder to sustain the legitimacy of experts, officials and representatives who, by definition, operate in the spotlight. Meanwhile, distrust, alienation and conspiracy theories become the norm, chipping away at the institutions that might hold us together.

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