Metadata is back in the news, following The Guardian's extraordinary revelation revealing that the National Security Agency has been secretly scooping up the phone records of millions of Americans. The "who," "when" and "how frequently" that metadata reveals can often be as telling as the content itself. Some people have something to hide, but not something to government ought to be able to reveal like being gay or pregnant or having a medical condition. Alternatively, you may think you have nothing to hide but end up in the crosshairs of an investigation because of a computer error on the government side. If we allow the government to start looking over our shoulders just in case we might be involved in wrongdoing -- mistakes will be made. Basically, privacy is about much broader values than just "hiding" things.