Mark Zuckerberg adds reservoir to his massive Hawaiian estate

Facebook founder Mark Zuckerberg and his wife, Priscilla Chan, have purchased 110 acres of a former sugar plantation reservoir on the Hawaiian island of Kauai. 

The agricultural land includes most of the earthen Ka Loko Reservoir, which tragically dumped over 400 million gallons of water when one of its walls failed in 2006, killing seven people, including a pregnant woman.