The intricate web of who knows what about whom forms the backbone of human social behavior, yet the developmental origins of this sophisticated reasoning have remained largely unexplored. New findings suggest children as young as four possess an intuitive understanding of how social connections shape information flow between people. Research involving 120 preschoolers demonstrated that children could predict whether Person A would know something about Person C based solely on their mutual connection to Person B. When shown simple scenarios where information traveled through social networks, children correctly inferred that closer social ties meant greater likelihood of shared knowledge. This capacity emerged consistently across different experimental conditions, suggesting it represents a fundamental cognitive milestone rather than learned cultural knowledge. The implications extend far beyond child development into understanding human social cognition itself. This early-emerging ability to map information networks may be foundational to later sophisticated social behaviors including reputation management, strategic alliance formation, and complex group coordination. However, the research involved primarily children from similar socioeconomic backgrounds, and the laboratory scenarios were necessarily simplified compared to real-world social complexity. The finding challenges traditional views that such meta-social reasoning develops much later in adolescence. Instead, it suggests our brains are equipped early with neural mechanisms for tracking the invisible information highways that connect people. This research opens new questions about whether this capacity varies across cultures and how it might be enhanced through early childhood interventions focused on social-emotional learning.