Google Webmaster Tools adds new feature in Labs*, you can create a special page owner entry for Google SideWiki. It allows you to enter some information for each website individually, like having a comment board on every website (actually for every webpage). It allows several HTML tags, usual forum stuff like bold, italic, underline… url.
*Webmaster Tools Labs is a testing ground for experimental features that aren’t quite ready for primetime. They may change, break or disappear at any time.
![Google Webmaster Tools sidewiki Google Webmaster Tools sidewiki](https://blog.igorware.com/wp-content/uploads/2010/03/google-webmaster-tools-sidewiki-300x146.png)
You could enter SideWiki comment from various browser extensions, but only special owner entry will be always visible on top of other user comments.