Susan Prescott, Apple vice president of product management and marketing, demonstrates the News app during the Apple Worldwide Developers Conference in San Francisco on Monday.
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By clicking "Like" and commenting on Facebook posts, users signal the social network's algorithm that they care about something. That in turn helps influence what they see later. Algorithms like that happen all over the web — and the programs can reflect human biases.
Apple CEO Tim Cook speaks in New York on April 30. This week, he said some of Silicon Valley's most prominent companies have "built their businesses by lulling their customers into complacency about their personal information."
Traffic stands still in Nairobi. People in Kenya's capital don't like getting into cabs driven by strangers. They prefer to call drivers they know or who their friends recommend.