In order to qualify content your users publish, you can define one or several labels (a.k.a tags) for each of pieces of content your subscribers wrote.
From the Newsfeed page, you just need to click on tag icon from a content to access the feature. Type in the dedicated field the label you want to affect to the comment. Then, the already used tags appears with an autocompletion, you can simply click on it to determine the label you wish.
Want to create a new label ? You can easily type the name and hit enter (using space or enter key).
These labels allows you to qualify contents. This qualification is shared with your team : you can see what content have been already qualified (labels appears on mouse rollover). All those tags are shared with your team members.
Nota : The labels are not publicly visible and are used by Nuke Suite to calculate post performance in Analyse area.