Discussions are used for exchanging information (comments & documents) between employees.
Discussions can be accessed via the Message icon in the navigation bar. Simply click "See all messages" → then enter the "Discussions" tab.
To start a discussion, click "Create topic" and select who you'd like to include in your discussion, indicating whether the post will be public or private. When a new topic is created, all employees receive updates about this topic automatically and everyone included can add comments.