Want to stay in touch (at least in a small way) with a friend? Add them to Facebook. They automatically will be added to your newsfeed. Don't really care what interests your friends have? Don't care about the pictures of their kids that they keep posting? Unsubscribe to their feed. Think of it as an RSS feed. Don't want to receive notifications? Don't comment on anything. Don't care what anybody posts? Don't check your news feed.
Don't care about others' opinions on news articles? Don't read them.
Don't care what anybody has to say? Become a hermit.
I don't see why Nat's friend ought to be responsible for the comments of his friends.