You cannot block Mark Zuckerberg on Facebook

San Francisco: With 500 million users and growing, it is the largest collection of people in 'one place' that the world has ever seen. Yet the one person immune to being blocked by a user appears to be the founder and chief executive.

If a user goes to Zuckerberg's Facebook profile page and hits the bottom of the left hand side, when attempting to block Zuckerberg the user will find that the action cannot be completed through a "general block failure error". This occurs on no other profile.