1) The document discusses how Yammer was introduced and adopted by Grundfos, a global pump manufacturer, over a 3 week period to connect 1500 users.
2) Some key lessons learned from Grundfos' experience included starting with a clear purpose for using Yammer, communicating the purpose and how to use it clearly, and showing the value and examples of how people were using it successfully.
3) Community managers and champions played a vital role in encouraging participation according to the 90:9:1 principle where most people view rather than contribute content. The speaker emphasizes being available to help users and address any concerns about using Yammer.
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