Facebook founder Mark Zuckerberg leaves a rehearsal for the California Hall of Fame induction ceremony in Sacramento California, December 14, 2010. Zuckerberg, founder and chief executive of The Facebook social networking site that has more than half a billion users, was named Time magazine's 2010 Person of the Year on December 15. Time defines the Person of the Year as the person who, for better or for worse, does the most to influence the events of the year. Photo taken December 14, 2010. [Xinhua/Reuters]