Which location-based mobile app first popularized the concept of 'checking in' at physical retail locations, revolutionizing how businesses leverage geographic data for customer engagement?

Location-based retail technology has transformed how businesses interact with customers in physical spaces. One particular mobile application revolutionized how people discover local businesses around them, creating a new paradigm for location-based marketing and customer acquisition. This app's innovative approach to connecting geography with retail discovery changed consumer behavior and created new opportunities for businesses to be found based on proximity and relevance.

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Foursquare
Yelp
Google Maps
Groupon