Every company wants to increase user engagement. But for a company like Meet Group, it was a life-or-death need. It runs four free dating apps (Meet Me, Skout, Tagged, and hi5), and relies largely on advertising -- which means when user engagement was down, ad dollars were down too. To fix this, cofounder Catherine Cook Connelly radically rethought how users engage in the apps. Now revenue is up, users are using the apps for longer, and matches are being made with... live video!?

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