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Internal social media sites — also called enterprise social networks — are becoming a routine part of corporate America. In fact, last year Deloitte predicted that by the end of 2013, more than 90 percent of Fortune 500 companies would have an enterprise social network — and those companies are getting a positive response from employees. For example, three years after Humana launched its internal social media site, 26,000 of its 40,000 employees were on it, with an average of 200 more joining each week.