Every single new communications technology we adopt brings with it a new social puzzle. What are appropriate discussion topics when sitting around a cooking fire? Is it acceptable for a gentleman to wear a wristwatch at a formal event? Does every fax need a cover page? And when it is ok to send pictures of your private anatomy to your beloved? If we apply a bit of logic and game theory to each puzzle, we can more easily discern the most polite way is to use each new medium. That is the essence of Tech Etiquette.