Google has recently released this a new extension for google chrome called Google Sidewiki, It allows you to contribute helpful information next to any webpage.
After installing you will need to enable the extension, as shown in the above image by clicking Ok Enable Sidewiki button.
You can do the following things with google sidewiki
1. Publish helpful information about any web page right in your browser
2. Read insights in context from Sidewiki entries added by others
3. Share Sidewiki entries through Blogger, Facebook, Twitter and Google profiles
For Example: Just like we had entered the description for TechnixUpdaate.com
Just like this you can enter description or your opinion about any web page with other through this cool google chrome addon , You can understand more about this addon by watching the video below. You can learn more about google sidewiki here
Install Google Sidewiki [ Google Chrome ]