Emerging technologies have always created new threats, redistributed power, and removed barriers to entry. Cannons meant a small force could destroy castles and level armies. A few colonial soldiers with advanced weapons could massacre thousands of indigenous people. The printing press meant a single workshop might produce thousands of pamphlets—spreading ideas with an ease that medieval monks copying books by hand could scarcely fathom. Steam power enabled single factories to do the work of entire towns. The internet took this capacity to a new peak: a single tweet or image might travel the
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