Item Collaboration Stream
At this level, you can see comments and connected users related to a specific item.
Here's an example of what the Stream looks like in List View:

How to access
There are several ways to view the Stream at the item level.
- In Project > List View, select the speech bubble icon.  
- In Project > Document View, select the speech bubble icon.  
- In Project > Single Item View, select the speech bubble icon.  
What you can do
- See comments and connected users related to a specific item. 
- See changes to items — Adding, editing, or deleting content from item fields, commenting on an item; using features like releases, baselines, or reviews that impact the item. 
- View items that are reused and synchronized and reuse details that appear in the Activity Stream. Users with read permission can view details about reused items and can select a link to view newly copied and synchronized items.