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No. Universal social networks add new functions to make work convenient and have modules targeting work life, but the expiration dates of files, laws, company regulations, safety concerns will not force people to become reliant on social networks when carrying out their daily tasks.
Though people use social networks more frequently at work, companies' internal systems and emails are still irreplaceable in terms of formal communications and work processes. Email use has actually risen over the past few years, rather than declined.