Luis Suarez says that social media contributes to over sharing of information and knowledge, while email tends to private and secretive communications.
Indeed, email fosters closed, private, secretive interactions amongst a few people, what I have been flagging all along as sharing your knowledge across on a need to know basis vs. what social networking tools do, which is promote that wonderfully inspiring mantra of default to open.
See original article at elsua.net
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E L S U A ~ A KM Blog Thinking Outside The Inbox by Luis Suarez » Life Without eMail – 5th Year Progress Report – The Community, The Movement 
E L S U A ~ A KM Blog Thinking Outside The Inbox by Luis Suarez » The Future of Work by 2020 
E L S U A ~ A KM Blog Thinking Outside The Inbox by Luis Suarez » Digital Transformation – It’s Just The Beginning