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As consumers become increasingly device-oriented, more and more businesses are utilizing Instagram to sell on the stealth. Some locals are smarting to the trend by leveraging their hefty followings to influence your choices.

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From finding Bob Crane's killer to nabbing the Phoenix freeway shooter, the Valley is awash in unsolved mysteries primed for Serial-liked resolutions. Could crowdsourcing investigations on the web deliver new answers to Arizona's most baffling cold cases?