Rather is a new service that helps you block key words you would rather not see on your facebook newsfeed. It is just an extension in the Google Chrome browser.
I think it's done in HTML5, which may be why I don't get any sound for it in Chrome -- not all browsers can manage all features of the new, drastically revised version of HTML yet.
These are different app for computers that will help you concentrate on your work rather than being on sites that you shouldn't be. Currently I am using the StayFocused chrome extension to block certain sites when I am working.