he internet has added a new dimension to the spaces of imagination in which we all live, and the problems of the offline world have moved there, too. This did not once seem an urgent problem, but in the last five years there has been a revolution of attitude around the world away from the anarchic culture encouraged by US law; at the other extreme is the very tight censorship imposed in China, where one popular startup employs as many people on content moderation as it does selling advertising.

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