Notes associated with tags are powerful as they expose comments of other users to the user community of that portal. The implication of this capability is that users can give information about a page or object and have others view it.
A possible shortcoming of this capability is that company information can possibly be exposed to the people who are not supposed to access it.
Consider the example of product pages. Product pages can be viewed by the whole company and may be rated as new products are developed. This is a powerful feature of SharePoint's new social features.
However, in rating the product, a person may mistakenly put financial information on the Note Board that is exposed publicly within the company. ...