https://www.wsj.com/articles/the-loneliest-generation-americans-more-than-ever-are-aging-alone-11544541134

«Researchers have found that loneliness takes a physical toll, and is as closely linked to early mortality as smoking up to 15 cigarettes a day or consuming more than six alcoholic drinks a day. Loneliness is even worse for longevity than being obese or physically inactive.»

[Edit: here’s what the kids over at Hacker News have to say: https://news.ycombinator.com/item?id=18638678.]