My question is, how could they tell? Could you decisively prove you're a human in only 140 characters?
Second this. Because it's set in a parallel universe very similar to our own (yet with striking differences), Anathem is heavy going for the first hundred pages or so, mainly because the language and cultural assumptions are unfamiliar. There are lots of made-up words that sound tantalisingly like English, but are not; the title of the book itself is one such word, a sort of amalgam of "anathema", "analemma", and "anthem".
But it is definitely worth the effort. It's the only Stephenson novel I've ever felt compelled to reread for the sheer joy of it.
WTF! This just bows me away. I know he is small, but how in the world did they manage to fit three Ferengi into a USB!?
Or maybe there are other Quarks out there?