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Re:Show HN: An interactive map of restaurants reviewed by th... by hanniabu on Wednesday September 30, 2015 @09:57AM (#10303955)
How did you check to see which locations are currently closed?
Re:Show HN: An interactive map of restaurants reviewed by th... by reedk on Wednesday September 30, 2015 @10:05AM (#10304009)
To be clear: The red pins are restaurants that have gone out of business and are closed permanently; not restaurants that aren't currently open, but will open later in the day for (e.g. for dinner).

The Yelp API provides data on whether a restaurant is still in business and is fairly accurate.