Airs Sunday, January 20, 2019, at 6 p.m. Silicon Valley once promised to solve many of the world’s problems with a technological revolution. But today the tech hub is the center of much scrutiny -- from privacy violations to flawed business models to a lack of diversity -- Silicon Valley has seemingly betrayed its idealism. But the valley's proponents believe that big tech’s detractors simply expect too much from lucrative corporations, and that its original "do good" attitude remains intact. Has Silicon Valley lost its soul? With Noam Cohen, Leslie Berlin, Dipayan Ghosh, and Joshua McKenty.