Back when antediluvian diners sought opinions without the help of the Internet, Tim and Nina Zagat built a restaurant survey and ranking empire, which grew into a sprawling international family of guides on everything from dating to dumping. Just before the financial collapse really got nasty, they tried to sell the whole enterprise for $200 million, and are rumored to have turned down offers as high as $100 million. Today, the Post finds the Zagats in deep weeds, largely due to competitors like Yelp, which now boasts more than 7 million U.S. visitors per month with reviews on all sorts of things, including Zagat! By comparison, Zagat's website, which requires a $25 annual fee, averaged just 270,000 unique visitors last month. The company laid off 16 people, and the Zagats have given up trying to sell it. As one Yelper opines, "If Zagat was the bomb, [Yelp] wouldn't exist, so thanks for sucking so bad, Zagat. I almost was forced to go to Chinese food in Chinatown due to an out-of-town colleague who had armed himself with Zagat and biblical notions of self importance... In the end, I won and we ended up at a real restaurant that didn't have to pay for a review." Well, not exactly.