Today, loneliness is down from its mid-pandemic peak, when 25 percent of U.S. adults reported feeling lonely “a lot of the day,” according to a Gallup survey. As gyms and offices reopen, 17 percent of us now say we feel alone, the survey indicates. It’s better than before, but 44 million lonely people is a problem worth attention.

Feeling alone has been linked to adverse health outcomes including heart disease, stroke, cognitive decline and low immunity. Some studies compare social isolation to mortality risks such as smoking. More recent research found links between loneliness and Alzheimer’s disease.

Loneliness also makes us feel more anxious and depressed, as we weather life’s storms without close friends to call for help. Americans’ circles of close friends have shrunk dramatically since the 1990s, according to the Survey Center on American Life. Gallup research estimates more than 300 million people globally don’t have a single friend, and one in five don’t have friends or family they can count on during difficult times.

One of our national pastimes is guessing who or what is responsible for loneliness, the ancient human condition. Is it social media? Remote work? The nuclear family? Not enough sidewalks?

In real life, causes of loneliness vary, Americans say. People get lonely after breakups, after moving or after soul-crushing jobs. Isolation also looks different at age 22 compared to 82. Many times, technology including social media helps forge new connections. Other times, it makes people feel worse.

The Washington Post asked people of all ages to share their experiences with loneliness and the role technology has played. From high-schoolers to new moms to people in assisted-living facilities, we’re examining how people find and keep their friends. Are tech companies helping the lonely or taking advantage of them? Join us as we tell their stories.