Yammer is an online service offering Web-based collaboration spaces with groups, conversations, and data sharing in a news-feed interface similar to public social-networking services, such as Facebook and Twitter. The service is positioned as a tool for communicating with large groups, as opposed to services like Teams and Skype for Business Online that are mostly focused on smaller functional groups. Yammer is licensed as part of Microsoft 365 Enterprise and Office 365 Enterprise suites.

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