The article you site claims the maximizing shareholder revenue is not a legal obligation of corporation. It further observes that "we evolved from a society in which corporate interests were largely aligned with those of broader public purpose into a state where crony capitalism, accounting fraud, and corporate predation are predominant characteristics".

So the article you link to strengthens the point of the parent that facebook is not in business for the public good but for private interests that are strongly at odds with public interests.