Easy. These services provide you with instant access to advice from other people who have been to that place before. For example, when I was in in NYC recently,

Easy. These services provide you with instant access to advice from other people who have been to that place before. For example, when I was in in NYC recently, I frequently consulted Foursquare to get recommendations about what to eat. Got some great advice that previous patrons had provided about the Marshmallow Shake. =)