The document discusses Edge Rank, the algorithm that Facebook uses to determine what posts users see in their News Feed. It explains that Edge Rank considers three main factors: affinity (the relationship between the user and the creator), weight (type of post and interactions), and time decay (freshness of content). It provides tips for marketers to increase affinity like tagging pages, asking questions to encourage responses, and posting more frequently with a variety of content like videos and photos. The goal is to help ensure users regularly see a page's updates in their News Feed.