Yammer is tool given by Microsoft office 365. It is a private social network. By this video we can learn how to create internal and external groups in Yammer. Yammer is a private Social network. Yammer allows user to work with selected people. Yammer can make internal and external groups to have a conversation at a common place. Yammer can also used to specify name of group members. By this video user can learn to create internal group in Yammer.