I Have a Suggestion for Similar Worlds

Making a post just now, I stumbled across two posts from a friend in the same group, of which I have been a member for ages. The posts were made during the last three days, in which period I have been online several times, but I had not been notified of them. I would never have seen them if I had not happened to make a post myself in the same group.

Why cannot SW organize its systems so that people are notified of their friends' posts? Or am I missing something? So far as I can see there is no point in having friends at all, except to show one's appreciation to other members.