Foursquare: Startup matures, finds new markets

By Jenna Wortham / The Bulletin
June 23, 2011

Foursquare, which made its debut in 2009, quickly began popularizing the idea of “checking in,” or using a cellphone application to tell friends that you are at a particular restaurant, bar or park.

Then Facebook and Google borrowed the concept — and even the term check in. Analysts and users....

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