Community Classification
Communities can be classified by applying categorization tags to them.
To do this, follow the below steps:
In the community Admin tab, click the Edit Classifications and Interests link.
This opens a simple dialog, the top half of which is depicted here. Enter a list of classifications separated by semicolons in this box, and
Click Save.
Communities sharing the same or related tags can then be displayed together by deploying the Community Discovery by Tags web part (available under the Newsgator Social web part grouping) and configuring it to list communities of only a particular category, or matching one of a list of categories.
Shown here is how to configure the web part to list only communities categorized with "department":
You'll want to also expand the Appearance section and provide a custom title. In the following picture, the web part has been configured with a custom title of Departmental Communities.