Social Squared allows you tag your topics and posts so users can easily locate other topics on similar subjects they are interested in.
When creating a new topic or post you can enter tags that define what the content is about.
Once users have entered a number of forum tags into Social Squared you can add the Tag Cloud Web Part to display the tags in use.
The larger the font, the more often a tag has been utilized. If you click on a tag then the forum web part will display all of the topics related to that tag.