In 2010, Mark Zuckerberg made headlines by donating a staggering $100 million to the Newark public school system — but four years later, how much good has the big-ticket donation actually done? Tens of millions went to buying out old teacher contracts — which Mayor Cory Booker and others saw as a necessary political step before unions would let them remake the current compensation system — while millions more went to consultants and construction projects that offered little tangible benefit to the citys students.