Yammer

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Snippet from Wikipedia: Yammer

Yammer (/ˈjæm.ər/ ) is a freemium enterprise social networking service used for private communication within organizations. Access to a Yammer network is determined by a user's Internet domain so that only individuals with approved email addresses may join their respective networks.

The service began as an internal communication system for the genealogy website Geni.com, and was launched as an independent product in 2008. Microsoft later acquired Yammer in 2012 for US$1.2 billion. Currently Yammer is included in all enterprise plans of Office 365 and Microsoft 365.