[See NewsBusters for more.] 60 Minutes journalist John Dickerson on Friday blamed a lack of a “common set of facts” and social media that “allows different information” for “destroying institutions” and leading to a possible constitutional crisis in America. Dickerson appeared on CBS This Morning to contrast the impeachments of Nixon and Clinton with that of Donald Trump. Offering a nostalgic look back at the era of three networks (and the supremacy of his own CBS), the journalist reminisced, “You know, during Nixon you had three networks. Some would say there was really only one network at the time.” Of course, conservatives point out that was a time of no Fox News, no talk radio, and powerful newspapers like the liberal Washington Post and New York Times dominating the landscape.