For every circle you create, there will be a new Friend list on Facebook and existing Friend list will be updated if you drag-and-drop profiles in existing circles. This worked for me perfectly on Firefox 4 while there were problems on Chrome 12 and somewhat less animated UI when tried on IE9.
To start using Circle Hack go to http://www.circlehack.com/ and login with Facebook. If already logged in, give access to application to fetch your friends and friend list. In a moment, you will be presented with Friends profile and Circles similar to Google Plus.
Once again, this is just an experimental application and not in anyway prove superiority of any of social network. If you like Facebook Interface then there is a way to give Facebook makeover to Google+.
