Schneier on Security: Identifying People from their Writing Style
Jared Sperli stashed this in security
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Identifying People from their Writing Style
It's called stylometry, and it's based on the analysis of things like word choice, sentence structure, syntax and punctuation. In one experiment, researchers were able to identify 80% of users with a 5,000-word writing sample.
Download tools here, including one to anonymize your writing style.