Google Sidewiki is an online service from Google launched on September 23, 2009.[1] Google Sidewiki is an extension for web browser. You have Sidewiki for Internet Explorer and Firefox through Google Toolbar.[2] You have Sidewiki for Google Chrome browser through an add-on. You have Sidewiki for other browsers like Safari as a bookmarklet.[3] When you visit a website with Google Sidewiki you can press on Sidewiki button. It opens a window where you can read others' comments or write your own comments. The owner of the website can not stop you from doing this.[4][5]