Oink is a mobile app that will allow someone to rate things, but:
Whereas sites like Yelp let people rate entire establishments, Oink lets you rate things within an establishment–like a particular dish or feature (balcony seating). The information can then be used by other people when they’re trying to decide where to go: Want to go to the place near you with the best chocolate chip cookies, for example? Search Oink for rankings for chocolate chip cookies.