guy discovers shame exists, wonders why it's not working

You haven't given any examples of a space that isn't designed for that, so what do you mean by that exactly? And I don't think I am misunderstanding your base argument at all. I guess my misunderstanding is, if people are oversharing on the internet, what is the point of that? What should anybody do about it? Are you saying they should be ashamed of themselves into conducting themselves how you think they should in these spaces?