- PR in a Changing World discusses how the media landscape and trust in institutions has shifted from a top-down model to a more horizontal, peer-to-peer model with the rise of technologies like the internet and social media. - Mainstream media is facing challenges adapting to this new landscape where audiences fragment across various platforms and have come to trust peer recommendations more than traditional advertising or news coverage. - This has implications for how PR and media companies must operate, focusing more on engagement with consumers across both top-down and peer-to-peer channels to build trust and influence in this new media environment.