Moves to shutter the president’s accounts and to crimp corners of the internet given to right-wing extremism raise thorny questions, both about free speech and social-media firms’ business models. Our social-policy editor takes a broad look at girlhood: how women’s adolescence has changed for the better but is challenged mightily by covid-19. And science’s bid to save more snake-bite victims’ lives.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
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