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"Anonymized" data really isn't—and here's why not - Ars Technica
arstechnica.com/tech-policy/news/2009/09/your-secrets-live-online-in-databases-of-ruin.ars, posted 2009 by peter in privacy recovery security
Companies continue to store and sometimes release vast databases of "anonymized" information about users. But, as Netflix, AOL, and the State of Massachusetts have learned, "anonymized" data can often be cracked in surprising ways, revealing the hidden secrets each of us are assembling in online "databases of ruin."