I wish I knew exactly what metric they're using. Spelling maybe, though I use plenty of nonstandard words. They certainly don't mark you down for profanity.
I'm guessing it just pulls your most recent post and checks one or two things. Maybe word count, percentage of misspellings, that kind of thing.
Or maybe it's random. I don't know. My blog's the genius, not me.
Regardless, you are smarter for having read this contentless post.