Jana Partners, the activist hedge fund, isn’t known as a tree-hugging hippie sort of firm. Yet, last month it joined with the California State Teachers’ Retirement System to send a letter to Apple’s board warning about the effects of the company’s devices on children. The same month, Blackrock CEO Larry Fink sent a letter telling companies that his firm would consider social responsibility when making investments. And Mark Zuckerberg told investors that Facebook would be making changes to its platform that would help users in the long-term, even though, he warned, in the short-term the result would be users spending less time on it.