Yammer is a social network that is part of Cornell's Office 365 services. It helps you to: work in groups more easily and effectively; share knowledge; find interesting conversations and join in; stay organized; and search and discover people, documents and conversations to get your work done.
https://www.yammer.com/cornell.edu/#/home
https://it.cornell.edu/office-365-productivity/yammer
All CCE
Yammer video training
Tutorials from LinkedIn Learning (sign in using your Cornell NetID credentials):