Yammer

Yammer is a social network for businesses built into the enterprise editions of Microsoft 365. It’s like a closed version of facebook or instagram that allows coworkers to stay in touch and work in projects.

It can also offer a global vision of the organization since all the members are mixed together and are allowed to post about every topic that involves the organization.

https://www.microsoft.com/en-us/microsoft-365/yammer/yammer-overview