How to Run XScreensaver as root with Locking

XScreeensaver must be one of the coolest programs ever, many of the "hacks" (screensavers) bring me nerdy delight. Unfortunately, do to security reasons it can't lock the screen as root. I understand this and think it is a good thing not to provide a false sense of security. However, understanding that the locking is not really secure I just wanted something that would prevent my friends from posting things to my facebook on the computer that I run as root (yes, I know I shouldn't).