Yammer

Yammer (www.yammer.com) is the leader in enterprise social networking, providing a secure way for employees to communicate, collaborate, and share information. The basic version of Yammer is free, and customers can pay to upgrade their network to receive additional administrative and security controls, priority customer service and a dedicated customer success manager. We have more than 4 million users using our award-winning Software-as-a-Service (SaaS) solution to improve employee productivity and engagement.