Cheeseburger day is being celebrated across Twitter, Facebook, and Instagram, and, more importantly, at America's cheeseburger joints. 

While Cheeseburger Day has been a thing on September 18 since the roaring 20s, social media has turned it into a promotional phenomenon, with some fast-food chains offering up free cheeseburgers to a limited number of customers. Others take the day as an opportunity to make a special cheeseburger.

Whatever way you choose to celebrate Cheeseburger Day, here's a map of America's most iconic places to get in on the action.

In this map:

About the Data: 

Thinknum tracks companies using information they post online - jobs, social and web traffic, product sales and app ratings - and creates data sets that measure factors like hiring, revenue and foot traffic. Data sets may not be fully comprehensive (they only account for what is available on the web), but they can be used to gauge performance factors like staffing and sales. 

Further Reading: 

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