These are heady times for the creators of HQ Trivia. The app, which broadcasts live shows to iPhones and iPads twice a day, has taken off since its debut in August. Its ability to attract tens of thousands of people to log in for each 15-minute segment in hopes of winning money by answering a dozen trivia questions has some wondering if it has reimagined the TV game show for the cord-cutting era. And its success with live-streaming video on phones — an area in which Facebook and Twitter have heavily invested, with mixed results — has the technology and

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