Will Google, Amazon and Facebook fix the affordable housing crisis?

From atop his gleaming new headquarters, Salesforce CEO Marc Benioff has an inspirational view of mountains, the bay and an endless Pacific Ocean.  But when Benioff looks down, he’s not so happy. Some 60 floors below his Salesforce Tower offices is what he calls “an inequality train wreck,” city streets "out of control" with thousands of homeless and often infirm citizens who have rendered sidewalks a landmine of feces and drug paraphernalia. Many have been destitute for years, but others are newly minted refugees of a housing crisis created in large part by the very technology boom that has made Benioff and other tech entrepreneurs billionaires many times over.