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The social media industry may have to struggle to rehydrate in light of some surprising and troubling metrics Facebook released on Wednesday. In addition to a pause in user growth, there have been signs that user engagement may have reversed course. The decline may have something to do with Facebook's efforts to recover from accusations that it has provided fertile ground for fake news. CEO Mark Zuckerberg last month promised to steer the company toward refocusing on the user experience. Better User Experience Zuckerberg stunned the industry during the company's fourth quarter earnings announcement on Wednesday, saying that while the company remained profitable, recent changes to shift the platform's focus away from news toward more meaningful interactions with friends and family had resulted in users spending 50 million fewer hours per day on the site. Daily active users in the U.S. and Canada fell by 700,000 from the third to the f...