Technology moves so quickly we can barely keep up, and our legal system moves so slowly it can't keep up with itself. By design, the law is built up over time by court decisions, statutes and regulations. Sometimes even criminal laws are left vague, to be defined case by case. Technology exacerbates the problem of laws so open and vague that they are hard to abide by, to the point that we have all become potential criminals.
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Sometimes legislators know when they make false distinctions based on technology. An "anti-cyberbullying" proposal is making its way through Congress, prompted by the tragic case of a 13-year-old girl driven to suicide by the mother of a neighbor posing as a teenage boy and posting abusive messages on MySpace.
The law would prohibit using the Internet to "coerce, intimidate, harass, or cause substantial emotional distress to a person." Imagine a law that tried to apply this control of speech to letters, editorials or lobbying.