Google recently announced Hotspot a location based search service recently which gives the places recommendations from google based on the ratings provided by fellow users.
Headover to http://google.com/hotspot and enter a place and start providing the rating to that place.If some your friends come to that place he will see your ratings about it.
If I’m in a new city, I might chat with the concierge at my hotel and explain to him the kinds of places I like so he can give me personalized recommendations, or I’ll ask my friends for local recommendations because I value their opinions and we have similar tastes.
If you are confused in using Google hotpot, Mat Balez, a Google product manager, explains how to use hotpot in this video.
Via (Google blog)