  We conclude this section by noting that SECs continue to face some critical challenges with respect to fulfilling their “gatekeeper role” in a socially responsible way, while simultaneously protecting both their proprietary algorithms and the interests of their shareholders to whom they also have legal and moral obligations. In the remainder of Section 4, we focus our attention on two different kinds of accountability-related ethical concerns affecting SECs: (i) moral responsibility/legal liability issues arising in cases where search engines have provided links to Web sites whose content can be considered morally controversial; and (ii) questions involving trust. We begin with an analysis of (i).