Commenting is everywhere on the web, and it’s generally very useful. What do other people think about a product? Check the comments. How are others reacting to a news story or article? Check the comments.
We no longer have to wonder what other people think about a product, recipe, picture, or nearly anything else on the web. Commenting facilitates interaction and lets anyone share their thoughts and opinions with others.
However, while commenting is widely used around the web, it has largely skipped the world of business applications. That being said, I believe that commenting does have a place in business apps, and could actually be quite useful.