Especially since there were apparently complaints that Yelp was doing pay-to-play with good reviews for a while, which diminishes the truthiness value of any reviews:
(Anecdotally, I also seem to be seeing this on Google Maps now! It seems like highly rated but local restaurants don't even show up on the map at all until I zoom in literally to the building -- perhaps because the owners don't pay for ads? Crazy if true... and Bing maps seem to not have all the restaurants or ratings, and you can't seem to filter based on rating either, which seems like a massive Bing fail. Maybe the review apps were always destined to crumble under a business model that encourages dishonesty on both sides..)