I recently posted 2 reviews on Yelp (I'm not very active on it; this was probably my 2nd and 3rd ever). I gave rave reviews for both. One is filtered, one is not. I see a 50% failure rate in filtering, from my extremely small sample size. Oh, and one of them was in NYC (the non-filtered one). The filtered one, well the chef knows who I am, since I said the same thing to him at dinner that I posted in the review.
Unfortunately that behavior pattern is exactly one that abusive users exhibit as well: innocuous review, long delay, glowing review of "target" business.
