The Community Server functionality allows you to narrow your data search through the tag browsing functionality.
Suppose you want to search your community wikis for data on a particular topic. You begin your search by opening the wiki home page. There you will find the list of your wikis in your community, the most recently published wiki pages, shortcuts to wiki functionality, and, if enabled, a tag cloud. The default Community Server theme supports the tag cloud widget.
Authors can create tags when they create a post or add tags after the post has been created. Tags are a way of organizing information and facilitating information searches. The default theme used by Community Server supports a tag cloud widget, so as you add tags, they display in the tag cloud.
You can look through the tag cloud for tags that are related to the topic you want to find. When you find a tag, click on it to display the list of posts that use the tag.
Above the list of wiki titles that display in the central panel is an additional list of tags that are used by the wikis in the list.
You can browse further by clicking on any of the additional tags.