When Mark Zuckerberg turned on Facebook’s News Feed in 2005, his users—exclusively college students at the time—freaked out at the notion that Facebook was automatically sharing their posts with friends. Even digital natives were scared to share much online then. But Zuckerberg waited a few days, explained the product, told his users to “breathe,” and News Feed became one of the most influential ideas of the 21st century.

Get in-depth coverage of current and future trends in technology, and how they are shaping business, entertainment, communications, science, politics, and society.