Internet Addiction

Has Facebook fundamentally transformed human behavior—and is such damage irreparable?

• By Jared Keller

New research finds teens who spend more time online are less happy. Sleep deprivation may be part of the problem.

• By Tom Jacobs

Smartphone penetration in Spain is similar to that in the United States, but nobody over there seems to be talking about addiction to technology. They are talking though—to each other, in person.

• By Kyle Chayka