D'mai Urban Spa in Brooklyn, N.Y. loves rainy days because it sees more customers when the weather is dreary. The Park Slope shop gleaned the information from Swipely's technology, which collects data on every customer that swipes a card in the spa.

Not only does Swipely aggregate data on the weather's effect on sales, it also grabs data from customers' posts on Facebook and other social media sites. Swipely also notes the time of each visit, the specific transaction amount and the consumer's average spending amount.

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