Do we know each other?

These days we make ephemeral connections through the Internet. Someone takes a class from me (or with me). Someone googles my name and wants to get in touch...after five or ten or twenty years. So I get a mysterious email like the one I got today. "Mary Jones announces she has started a blog." Who on earth is Mary Jones? No clue: she sent her announcement to a bcc list so I can't place her in context. Well, she's probably a terrific person, but I'll never know. The links to her new blog don't work either.