Artificially intelligent "bot" accounts bolster or berate politicians on Twitter. Conspiracy theorists publish junk news sites to promote their bunk. Campaigners create fake dating profiles to attract young voters. We live in a world of technologies...

Should we fear or welcome the internet's evolution? The "internet of things" is the rapidly growing network of everyday objects-eyeglasses, cars, thermostats-made smart with sensors and internet addresses. Soon we will live in a pervasive yet invisib...