About half of my friends post every move they make throughout the day, photo-illustrated, to Facebook. They also have numerous short conversations with their fr

About half of my friends post every move they make throughout the day, photo-illustrated, to Facebook. They also have numerous short conversations with their friends, that are clearly just between the two of them and would normally be of no interest to anybody else. It's the equivalent of having private conversations out loud in front of everyone each of them have ever met in their lives. I do not understand any of this behavior. I'm said to be a 'private person.' But it's clear to me that the zeitgeist is definitely not on my side here. I also wonder what all of this will be like in 20 years, given that Facebook has only been in widespread use for an utterly paltry 5 years.