Earlier quoted context omitted.
Why not remove these persons you don’t feel close to from your friends list ? When I was using facebook, after I moved in life, say going from highschool to university and my list grew with my new university acquaintances there, I pruned it from the acquaintances of the past life, high school people I knew didn’t matter so much to me once they were not part of my life anymore. So my friend list organically went throu…
Because I kinda want to keep up with their big events. Like kids, marriages, jobs, a new house or whatever. And I see some of them occasionally when "back home" and then it's nice to have kept somewhat superficially in touch. And fb works for that. It's just all the day-to-day stuff no one posts anymore.
The way that we describe the action, "un-friending", probably influences the notion that it's a serious / rude thing to do. We need some kind of UI that emphasizes that it's not a big deal whatsoever and is not a rude thing.