Which mobile app was the first to widely popularize location-based check-ins and merchant deals, creating a geographical framework for mobile commerce?

Location-based services revolutionized how retailers connect with customers on the go. This trivia question explores which company was the first to popularize location-based check-ins and deals, creating a framework that influenced countless mobile commerce applications in the geography and retail space. Test your knowledge of how digital geography transformed shopping behaviors!

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Foursquare (2009)
Yelp Check-ins (2010)
Google Latitude (2009)
Facebook Places (2010)