I see more and more non fiction writers referring to Internet in their books. More often than not these are consigned to the footnotes so that the flow of the text does not break. And you know what such references actually enhances the pleasure of reading such books.
Here's an example from Kluge by Gary Marcus ...
If you should mishear John Fogerty's "There's a bad moon on the rise" as "There's a bathroom on the right" so be it. Or Jimi Hendrix's "Excuse me while I kiss the sky" for "Excuse me while I kiss the guy." If you, like me, get a kick out of these examples, Google for the term Mondegreen and find oodles more.
And so I did and now I know what Mondegreen means. I also recollect an old Hindi joke of an extremely bad taste where Mondegreen was used. "There was a cold day" was heard as "Darwaza khol dey" (open the door) when the person singing is taking a shower in the bathroom whose door wouldn't latch.
Ok! Here's a take away for Dan Brown or a would-be Dan Brown. :D
How about writing a fiction with clues hidden on Internet? The interested readers would be invited to search the Internet to figure out the clue for themselves. Of course, the skill lies in writing so that even those who are too lazy to search the Internet for clues would enjoy the story. Now that would be something.