But 17 years later, things are very different. The computers I love are being co-opted, used to spy on us, control us, snitch on us. The National Security Agency has illegally wiretapped the entire USA and gotten away with it. Car rental companies and mass transit and traffic authorities are watching where we go, sending us automated tickets, finking us out to busybodies, cops and bad guys who gain illicit access to their databases. The Transport Security Administration maintains a "no-fly" list of people who'd never been convicted of any crime, but who are nevertheless considered too dangerous to fly. The list's contents are secret. The rule that makes it enforceable is secret. The criteria for being added to the list are secret. It has four-year-olds on it. And US senators. And decorated veterans -- actual war heroes.

The 17 year olds I know understand to a nicety just how dangerous a computer can be. The authoritarian nightmare of the 1960s has come home for them. The seductive little boxes on their desks and in their pockets watch their every move, corral them in, systematically depriving them of those new freedoms I had enjoyed and made such good use of in my young adulthood.

What's more, kids were clearly being used as guinea-pigs for a new kind of technological state that all of us were on our way to, a world where taking a picture was either piracy (in a movie theater or museum or even a Starbucks), or terrorism (in a public place), but where we could be photographed, tracked and logged hundreds of times a day by every tin-pot dictator, cop, bureaucrat and shop-keeper. A world where any measure, including torture, could be justified just by waving your hands and shouting "Terrorism! 9/11! Terrorism!" until all dissent fell silent.

We don't have to go down that road.

If you love freedom, if you think the human condition is dignified by privacy, by the right to be left alone, by the right to explore your weird ideas provided you don't hurt others, then you have common cause with the kids whose web-browsers and cell phones are being used to lock them up and follow them around.

If you believe that the answer to bad speech is more speech -- not censorship -- then you have a dog in the fight.

If you believe in a society of laws, a land where our rulers have to tell us the rules, and have to follow them too, then you're part of the same struggle that kids fight when they argue for the right to live under the same Bill of Rights that adults have.

This book is meant to be part of the conversation about what an information society means: does it mean total control, or unheard-of liberty? It's not just a noun, it's a verb, it's something you do.

DO SOMETHING

This book is meant to be something you do, not just something you read. The technology in this book is either real or nearly real. You can build a lot of it. You can share it and remix it (see THE COPYRIGHT THING, below). You can use the ideas to spark important discussions with your friends and family. You can use those ideas to defeat censorship and get onto the free Internet, even if your government, employer or school doesn't want you to.