There are many restaurant apps around that rely on users to input location on their locale or sites they visit to create a national or international database.
The most recent one I have found out about is The Monterey Bay Aquarium Seafood WATCH Project FishMap which asks users to share information on the locations of restaurants and markets for sustainable seafood. It provides seafood pictures and a list of seafood that is ocean friendly.
According to the Seafood WATCH website, they make
recommendations using science-based, peer reviewed, and ecosystem-based criteria. They state that “Since 1999, we’ve distributed tens of millions of pocket guides, our iPhone application has been downloaded more than 240,000 times, and we have close to 200 partners across North America, including the two largest food service companies in the U.S.”
The downloads and partners are important because voluntary apps are only as useful as the quantity of participants and quality/reliability of the information they enter.