We tend to think of revolutions as loud: frustrations and demands shouted in the streets. But the ideas fuelling them have traditionally been conceived in much quieter spaces, in the small, secluded corners where a vanguard can imagine alternate realities. The Quiet Before is a grand panorama, stretching from the 17th-century correspondence that jump-started the scientific revolution to the encrypted apps used by epidemiologists fighting the pandemic in the shadow of an inept administration. Beckerman shows that defining social movements - from decolonization to feminism - thrive when they are given the time and space to gestate. Today, we are replacing these productive, private spaces with monolithic platforms. Beckerman reveals what this new social media ecosystem still needs - from patience to focus - and offers a recipe for growing radical ideas again.