Netopi is a way to add and read reviews of any website: An item in an online shop, CNN´s article, hosting company offer... and it doesn´t matter whether a possibility of leaving a review is or is not given by the owners of those websites.

After installing Netopi Firefox extension, you will see it in a sidebar (if you can´t see it, click View | Sidebar | Netopi in Firefox menu). Now, you can visit any website to see what people think about it. You will be also able to add your own opinions.

The opinions are stored in a central database, not related in any way to the owners of those websites, and so, they are under no control of the owners.