Useless for people administering several FB accounts & pages with one or more browsers (or using a secondary browser for their FB profile for privacy reasons). I use Safari, Firefox, Camino, Opera and RockMelt for different clients' FB accounts. Facebox uses your main browser's FB cookie, and there's no preference item to change that or select accounts. So if you log into FB with a secondary browser or more than one browser, this menu app is not for you. Of course you can always log in, out, in, out, in manually all the time, but that's not really cool, and Facebox will always mess with your main browser's FB cookies then. If you want your main browser to stay FB-cookie-free, don't use Facebox either.