FOMO [fear of missing out] is a great motivator of human behavior, and I think a crucial key to understanding social software, and why it works the way it does. Many people have studied the game mechanics that keep people collecting things (points, trophies, check-ins, mayorships, kudos). Others have studied how the neurochemistry that keeps us checking Facebook every five minutes is similar to the neurochemistry fueling addiction. Social media has made us even more aware of the things we are missing out on. You’re home alone, but watching your friends status updates tell of a great party happening somewhere. You are aware of more parties than ever before. And, like gym memberships, adding Bergman movies to your Netflix queue and piling up unread copies of the New Yorker, watching these feeds gives you a sense that you’re participating, not missing out, even when you are.
Sometimes, you don't go to that amazing event because you're just going to stay home and read a book or watch TV or flick away idly at your phone, only realizing you've missed the moment when it's already too late. And then, when you get old and wonderfully, contentedly boring like me, you stay home because you'd rather be there for bathtime and bedtime with the baby than, well, anywhere else in the world.
It's sad, but it's also ... great, really. Imagine if you'd seen everything good, or if you knew about everything good. Imagine if you really got to all the recordings and books and movies you're "supposed to see." Imagine you got through everybody's list, until everything you hadn't read didn't really need reading. That would imply that all the cultural value the world has managed to produce since a glob of primordial ooze first picked up a violin is so tiny and insignificant that a single human being can gobble all of it in one lifetime. That would make us failures, I think.