Corporations never had "responsibility towards society". In fact I much prefer corporations that don't pretend to have such a burden. It's almost always a false front.
Corps have a responsibility to deliver a product or service at a competitive price in order to sustain growth.
Friedman was an economist, not a corporate whisperer. To the extent that corps changed, they were forced to by market forces, most notably globalization, a force much bigger than one man and a force that was inevitable and even necessary in the wake of world war one and world war two.
