Facebook knows who to display -to you- as your shown friends on your own wall… and that, by itself, should be a lot more frightening than… well, a lot of things that actually aren’t even scary. They pick 9 to show me. And the pick is excellent. And that is really confusing, because… the nature of my activity here means they are using extremely effective selectivity criteria. And I am fairly sure I can see what a few of the selectors are.