Young Tech Donors Take Leading Role in Philanthropy 50

America’s 50 most generous donors increased their giving by 27.5 percent last year — powered in large part by a $1.5 billion gift from Bill and Melinda Gates and a stunning rise in the number of tech entrepreneurs under 40, three of whom gave more than $500 million each. The increase is striking compared with 2012, when giving by the Philanthropy 50 rose just 4 percent.