When checking businesses on Yelp!, look at the ratio of reviews to filtered reviews. If you see 50 reviews and 200 filtered, that's sketchy. If you see 50 reviews and 10 filtered, it's kosher.
One of the few things I will brag about in our favor is the genuine nature of our reputation. Knock on wood; five years in, we've never paid for a "like" or review. Fuck that noise.