ON THIS LINK

I just came back from a trip to San Francisco. Apart from having a great time, I discovered a new social media site that just blew my mind and blows the competition away.... Yelp.com is not a new idea by any stretch of the imagination -- haven't reviews of local restaurants, nightlife, bars, businesses, etc. been done to death? Citysearch, for instance, founded in 1995 by idealab, would have cornered the market in local reviews, right?