Posner in 2009, via Wikipedia
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Posner argues that privacy isn't guaranteed by the Constitution, so why even worry about it in the ongoing national security battle?
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The answer of course depends on what conduct you are talking about. It’s clear that using Google is not private conduct, and even going into a private browser will not stop your ISP or employer from tracking your history.But social media is arguably a realm wherein people do still have an expectation of privacy. Even generic Facebook posts are meant for a limited audience of followers. Maybe you have 100,000 friends, but that doesn’t necessarily foreclose your expectation of privacy with respect to that limited forum. It is no different than sending a private letter to 100,000 people, which would all be protected.If law enforcement can tap into that information, they risk chilling people’s speech in a forum that should still be thought of as private (unless your account is set to be public; then you should expect less privacy). In that sense, Posner’s notion that privacy exists merely to conceal may be misguided. Privacy is a space where we engage in discourse, we dissent, we make love, we make art, we mourn, we make meals, we grow—not necessarily because we are ashamed or want to hide it, but because we are comforted, encouraged, and strengthened by our ability to limit the size of our audience.Perhaps the Constitution does not protect your right to go undetected on the street, but the need for security cannot justify the destruction of the zones of privacy that the Constitution does protect. Those zones of privacy seem to be diminishing as law enforcement begs us to reconsider what expectations of privacy we believe are reasonable and we should be wary of setting a precedent where our electronic footprint no longer merits any privacy at all.Each time we determine that “security” outweighs privacy interests, a hazardous precedent is set.