Surgeon General Vivek H. Murthy recommended putting a warning on social media for minors last week, while governors from coast to coast have pushed for restrictions on teen phone use. But how worried should we really be, and what is there to do about it? Post columnists Amanda Ripley, Molly...

It’s been a rough few years for movie theaters, and the dismal start to the summer blockbuster season hasn’t helped. If people go to theaters less often, will that change the type of movies that are made? Is the future of moviegoing a boutique, high-end experience? Matt Belloni, host of “The...