jfruh writes: "Metadata" has been the buzzword of the moment since Edward Snowden's leaks revealed the extent of NSA spying on Americans and others. It's the "meta" part, says the government, that ensures that the spooks can look for bad guys without really invading our privacy. So: what does the metadata that we all generate by the gigabyte actually say? And what have private companies been doing with it for years?
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