If you want to share your opinion on any website on the Internet, this is the extension you need. It allows you to do that from the app or directly on the web browser. This is how a comment is supposed to work: you write a comment and add some information, then it gets posted on a site. It is usually useful for sites with no built-in comments system. If you need a more advanced option, it can be used with any website: it can be used with most of the websites that are not the first on the Internet. You can also easily place a comment with your Facebook page.