I was on a panel on wearable computing a couple days ago, and an interesting question came up:
Ten years ago, when you picked up the phone you asked Who is it?
Today, with cell phones and Caller ID, you pick up the phone and ask Where are you?
What question will be asked ten years from now?
My guess is that even when you meet someone face-to-face you’ll ask Who are you with?, with the assumption that your friend might have invisible cyberspace tagalongs with her and that it might not be polite to butt in on the middle of their conversation.