Not that perfect of a hideout. I'd love to see someone collect data for cases where they think Yelp is intentionally manipulating reviews and see how many cases aren't easily explained by good filtering criteria.

[Full-disclosure: I'm friends with a good number of Yelp engineers who I expect would leave rather than take part in these such things, but I don't know any more about their codebase than any other non-Yelper.]