OK, so it's a silly meme, and I really should have been writing (thank you, Mighty Mur!) - but I didn't pay the slightest bit of attention to the marketing messages. The ubiquity of that ****ing "lose x pounds of belly fat" ad has caused my brain to develop a major blind spot to internet advertising of all kinds
OTOH I'm pretty sure it's not totally random. Apart from an excess of James Joyce (huh? Is that the default "I have no idea" result?), most of my hits were SF, fantasy, or 18th century writers like Defoe and Swift. I suspect the vocabulary is a major element - no modern technology in my book, but plenty of non-contemporary stuff (swords, doublets, etc)...