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On average, in the US, using those three records, you could be correctly located in an “anonymized” database 81% of the time. Given 15 demographic attributes of someone living in Massachusetts, there’s a 99.98% chance you could find that person in any anonymized database.
Via Farid Mheir
WHY IT MATTERS: most of the population of Quebec is freaking out about the breach of 3M personal records recently. It is bad and should not go unnoticed but this study by MIT should put the breach in perspective: basically you cannot expect anonymity in this digital world. C'est la vie...