I'm not sure how this works but its pretty cool.
By submitting entire blog posts I have been told that I write like:
-H.P. Lovecraft (posting about psychoanalysis & Nietzsche)
-David Foster Wallace (global water shortage & a 2nd time in a review of the book "Past, Space & Self")
-Edgar Allan Poe (cosmology)
-Kurt Vonnegut (philosophy of Nietzsche)
I went back and resubmitted the same posts a second time in random order replicating the original outputs. Apparently word choice and style can be compared against famous authors. I wonder who exactly is on the selection database. The hyperlinks to amazon.com search results is a nice touch.
Who do you write like?