As Mario Gomez-Hall walks me through his new restaurant discovery app, Zest Maps, the founder pauses on its user leaderboard and highlights a profile topping the charts with over 1,000 visits logged.
Foursquare was once believed to be the next big social app. On storefronts, business owners featured a Foursquare logo, next to Facebook and Twitter. People flocked to it to learn what their friends ...