It is possible to manage categories in the News Feed, to modify existing categories or add new ones.
Note that you must be an administrator to have these options.
Manage categories
To manage New feed categories, first go to the News feed by clicking on “News feed” in the main menu on the left, and then click on “Manage categories”.
You will then have 3 options:
Delete a category by clicking on the red circle on the right
Modify the name by clicking on the category
Create a new category