Yelp, Chowhound, Angie's List, TripAdvisor: user-generated community sites are all the rage these days. The sites offer a democratic way for companies to present themselves, as all of the reviews are contributed by regular, everyday people with a passion and an opinion.
Here in Argentina, there is a restaurant-review site which is wildly popular: Guia Oleo. Boasting 100,699 reviews from 482,970 users, the site has information for 4,609 restaurants. Not quite the size of Zagat.com or even TimeOut, but the numbers are certainly impressive.
Too bad I learned of this after eating at several Buenos Aires restaurants, but I'll create and account and start reviewing.