So, I happened to click on the Friends icon on FB this evening, and the first person on the "people you may know" list that the FB wizards serve up is indeed an acquaintance, but I can't for the life of me figure out how the *hell* FB knows that I know her. We have absolutely zero direct contact (no phone, no email) and the one solitary person through whom I know her is not on FB. Just bizarre.
On the bright side, when I clicked on the icon again for giggles, the randomness that is FB produced the page of my fifth grade math teacher, who at least knows other people in my network. That makes a little more sense. And since, as it happens, this is a guy to whom I've owed a major debt of gratitude for oh, about THIRTY years now, I took the opportunity handed to me by the universe to send him a message saying 'thanks.' It's not an exaggeration to say that he changed the entire trajectory of my life, academically speaking at least, so I should have found a way to make it happen long ago.