Yammer is an online service offering collaboration features similar to public social networking services such as Facebook and Twitter. Yammer sites and groups enable users to communicate with one another using microblogging (threaded conversations using short messages as on Twitter) and instant messaging (IM). Users track communications and other activity from people and topics of interest on an automatically compiled discovery feed (newsfeed) page: they follow other users, topics, and files and receive notifications about them on the feed.

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