When creating a news article, or a poll, you have the option to allow your employees to leave comments on them.
The ability to leave comments increases the overall 'community' feel of the portal, and lets people share ideas and voice their thoughts.
However, like any social media avenue, it also opens up the platform for potential abuse or other troubles.
Please be aware that when you go to edit an existing article, if you scroll to the bottom, you can see the comments that your employees have entered to date.
As the article creator, or the administrator, you can add your own comment (i.e. to warn or encourage employees), and you can delete any employee comment that you deem unsuitable or unfit to be viewed by others.