In the “Categories” section you can create different categories. A category is a subgroup without a web page. It is there mainly for the purpose of leading a group dialogue. To create a category, click “Create category”.
You can assign your category a name, description and color. After that, you can invite to your category any members of your business you think this particular group dialogue concerns. All of the messages that the category members exchange will be visible on the social wall to only them. The category's posts will be marked with the color you assigned to it while creating it.