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Before Foursquare, there was Dodgeball. Launched by Dennis Crowley in 2004, the app allowed users with cell phones to share their locations with friends via text message. Google bought the social app in 2005, but killed it after it failed to attract a following. Crowley went on to fine-tune the product, adapting its technology to eventually create the immensely popular Foursquare.
Lesson: Don’t give up. Figure out what isn’t working and create something better.