That happens in person too though. One of my jobs, I deal with elderly people. They try to keep tabs on each other because no one else is going to. After a certain amount of time, your friends just die off and no one can tell you whatever became of them. Or sometimes they don't die off; they go to live somewhere else, like with family. But family doesn't know their friends and doesn't inform them. Seems like a normal thing for people to just fall out of one's life out of the blue like that. Even the young.