ACM Interactions

Authors:
Elizabeth Churchill

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"I'll wall you," someone teased me the other day. If you do, I'll poke you, I retorted. We both laughed. The person sitting next to us looked mystified. I proceeded to try and explain that no, my friend wasn't going to come to my house with a spray-paint can and personally annotate a wall. And no, I wasn't going to reach over with my bony index finger and prod him in the side. Give it a shot: Explain to someone who has never been on a social-networking site, much less used Facebook, what it means to "write on my…

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