Yammer is an internal social network for enterprises. If you are trying to introduce Yammer in your organization or make a case to senior management of its usefulness then this illustrated PowerPoint guide is for you. It's permanent home is on the Business Illustrator blog: http://www.businessillustrator.com/visual-content-marketing/introducing-yammer-in-your-organisation-illustrated-powerpoint-presentation/ (The guide first appeared as an infographic in the official Yammer blog).