Microsoft's Yammer is a leading private social network the helps employees collaborate across departments, locations and business apps. Companies large and small, as well as all varieties of nonprofit organizations, use Yammer for private communication within the company or organization.

Access to a Yammer network is determined by a user's Office 365 account, so communication is easy and secure. If your company or nonprofit already has Office 365, you may be entitled to upgrade to Yammer Enterprise.

To learn more about Yammer, click here: