  In Section 4.3 we further examine the concept of trust in the context of SECs. First, however, we conclude this section by noting that as of this date, no clear and explicit policies have been adopted by major SECs regarding FN. In fact, there is no evidence to suggest that SECs even see themselves as bearing any level of responsibility for the rapid spread of FN. Many SECs would likely argue that if any entity ought to be held responsible for the widespread FN on the Internet, it should be the social media sites and the blogs on which most of that misinformation is originally posted. Unfortunately, however, an adequate analysis of the role of social media sites and their specific responsibility in the FN controversy is beyond the scope of this entry; for more information about ethical issues affecting social media sites per se, see Vallor (2016).