The document discusses the evolution of personalized media and the challenges it presents. It notes that as the amount of available content grows, it becomes harder for people to obtain, choose, and sort through everything. Personalization aims to help with this by filtering content based on popularity, affinity, and suggestions. However, personalization also risks people no longer being able to arbitrate for themselves or recognize content that doesn't directly resemble their interests. Moving forward, the media will need to balance highly personalized experiences with exposing people to unexpected or diverse content. It will also need to address challenges like personalization mutating audiences and the public nature of private personal data used for personalization.