The document discusses the "influencer web," which is a model of the internet centered around influencers and their followers. [1] Influencers create "activity centers" around trending topics that influence opinions. [2] These activity centers are made up of influencers like journalists, celebrities, and experts, as well as their large follower bases. [3] The document proposes using an "influencer web extraction engine" to analyze these activity centers and provide brands with insights into consumer sentiment and the effectiveness of their social media strategies.