Can Google aggregate everything you've ever posted anonymously online based on writing style?
michael_nielsen: Donald Foster (http://en.wikipedia.org/wiki/Donald_Foster_(professor) ) is sometimes known as a "forensic linguist" for his use of computers to analyse texts.  Famously, he figured out the (formerly anonymous) author of the bestselling novel "Primary Colors" using computer analysis.  If you're interested in this kind of thing, I highly recommend starting with the Wikipedia article, which describes a lot of Foster's work.