The watchword was unity as Joe Biden took office—he struck a calming tone and got immediately to work. We analyse the gargantuan tasks that lie ahead. Messaging services such as WhatsApp provide a needed online forum; as users flood to new apps we examine questions of privacy and security. And the Parisian street artist depicting brutal protests to unsettling effect.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
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