Foursquare Signs Deal with Zagat

An interesting development which links the game like approach of Foursquare with restaurant rating service Zagat. I am still skeptical since there is no assurance that the participant has ever physically visited the restaurant and thus the system is easily cheated. Still looking for an easy way to ensure this, based on my reading of the article though there will be ways to see reviews entered, people will still be able to check-in to a restaurant from anywhere. Comments?