Make sure you stand in front of the group with a message from the MT.
Prepare the most obvious questions about privacy and security . The Yammer website tells a good story about this that you can immediately incorporate into your presentation.
Leave enough time for practical explanations. My experience is that everyone really saudi arabia mobile phone number list sits up when you open Yammer and show them how to adjust the email settings, for example.
Make use of your ambassadors.
Tip:
At some point in your presentation, ask who already uses Yammer extensively. Bring those people forward and ask them to share their tips and tricks with the group. That last tip will save you a lot of time. After a few presentations, you will notice that you will be known as Mr. Yammer in the organization , with the result that literally everyone comes to you with Yammer questions. By putting heavy users forward as experts, you spare yourself.