Technology

Parents should be paying very close attention to the digital media their children are using, says child advocate James Steyer. "Young people in particular often self-reveal before they self-reflect," he says. "There is no eraser button today for youthful indiscretion."

Advertisers collect information with every digital move people make. They then target ads based on that information. Communications scholar Joseph Turow worries that advertisers will use such data to discriminate against people and put them into "reputation silos."

YouTube's future success depends on increasing the amount of time people spend watching videos on the site. The Google-owned website plans to roll out more than 100 new, professionally produced channels in a push to draw viewers away from television, and onto the Web.

As protesters in the Middle East use social media to communicate, the regimes they're battling are using sophisticated technology to intercept their emails and text messages. Journalist Ben Elgin details how Western companies are providing software and equipment to help Middle Eastern governments crack down on dissidents.

Technologies like GPS and social media are posing new challenges to interpreting the Constitution's guarantees of privacy and free speech. Law professor and journalist Jeffrey Rosen says we're now in an era the Founding Fathers could never have imagined, in which private companies are determining the rules for what can be shared.

Theoretical physicist Michio Kaku descries some of the inventions he thinks will appear in the coming century -- including Internet-ready contact lenses, space elevators and driverless cars -- in his book Physics of the Future.

Facebook, Google, Amazon and Apple are expanding rapidly into finance, advertising, media and retail. Tech writer Farad Manjoo outlines how the four companies are heading in new directions -- and encroaching on each other's territory -- as they try to expand their customer base.

After Steve Jobs was diagnosed with cancer, he asked Walter Isaacson to write his biography. The new book tells the personal story of the man behind the personal computer — from his childhood in California to his thoughts on family, friends, death and religion.

The "i" prefix began as an abbreviation for the word "Internet," but ended up being much more than that. "By the time i- was fleshed out, Apple had transformed itself from a culty computer-maker to a major religion," says linguist Geoff Nunberg.

In a new book, medical ethicist Harriet Washington details how genes and tissues are increasingly being patented by pharmaceutical and biotechnology companies. Those firms, she argues, are focused more on their profits than on the medical needs of patients.