That's too bad. I'd especially like to see how it'd work on comments, where I'd try to teach reddit to avoid in-jokes.
As for Amazon, maybe its recommendations are intentionally unrefined, like how Target discovered it needed to obscure its direct mail campaigns aimed at newly pregnant women ( http://www.nytimes.com/2012/02/19/magazine/shopping-habits.h... ). Granted, it's plausible Amazon just hasn't cracked the code yet.
As for Amazon, maybe its recommendations are intentionally unrefined, like how Target discovered it needed to obscure its direct mail campaigns aimed at newly pregnant women ( http://www.nytimes.com/2012/02/19/magazine/shopping-habits.h... ). Granted, it's plausible Amazon just hasn't cracked the code yet.