The document outlines the evolution of PR distribution models, from the traditional method of distributing press releases to journalists in print and broadcast media, to the modern model where PR content spreads through social channels. It describes how traditional PR distribution relied on press releases and wire services to reach consumers through journalists and media outlets. However, this model became less effective as consumers began getting news from more diverse online sources in addition to traditional media. The modern distribution model therefore focuses on using social media and influencers to spread PR content more widely to consumers.