Regarding the spreading, a tweet from some real author will be great (how?). And what about publishing some real-time stats about the results? i.e. 30% of our users write like Dan Brown, 10% like xxx, etc...
EDIT: "Margaret Atwood, who is in our database of famous writers, tweeted about it (apparently, she doesn’t write like herself… oops :)" Already happened... enjoy the exponential growth in visits :)