Mark Zuckerberg, i.e. the king of the digital world, is said to be the mystery buyer of a home on 12th Street in the West Village, according to a report today in The Observer. The 3,200-square-foot, single-family home at 157 W. 12th St. was sold to the Facebook cofounder and CEO, "or someone else in the Zuckerberg clan," for $22.3 million, the Observer reported.