As a community user, you have the opportunity of rating the value of forum content. Community Server uses a star rating system, which looks like this:
If you find a post that you particularly liked or found valuable, you can give it a high rating by highlighting four or five stars; or you can mark fewer stars for a post that you did not find useful at all. The more stars you highlight, the higher the rating. These ratings can be useful to remind you of the value of the post or to alert other members of the community to its value.
Procedure
The rating box displays in the forum post list when you close the post.