How Silicon Valley hooks us

Justin Rosenstein had tweaked his laptop's operating system to block Reddit, banned himself from Snapchat, which he compares to heroin, and imposed limits on his use of Facebook. But even that wasn't enough. In August, the 34-year-old tech executive took a more radical step to restrict his use of social media and other addictive technologies. Rosenstein purchased a new iPhone and instructed his assistant to set up a parental-control feature to prevent him from downloading apps. He was...