Yammer, Inc. is a freemium enterprise social network service that was launched in 2008 and sold to Microsoft in 2012.
Yammer is used for private communication within organizations or between organizational members and pre-designated groups, making it an example of enterprise social software. It originally launched as an enterprise microblogging service and now has applications on several different operating systems and devices. Access to a Yammer network is determined by a user's Internet domain, so only those with appropriate email addresses may join their respective networks.
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