Imagine meeting someone at a business conference, you greet one another, shake hands, have a conversation, and walk away. The next day you want to get in touch with that person, but only remember their face. So you scroll through all your most recent handshakes on your apple watch, find that one guy's face, and now you've got his name, email, e-business card, whatever. Obviously the privacy would have to be tailored such that you can decide what info to give up when you shake hands with another apple watch owner, but I think it's a pretty clever idea nonetheless, no? I bet Apple Watch 2 will have it.