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Social Network Theory

Social network theory is a sociological framework that treats social relationships as a measurable structure with its own properties — rather than merely a backdrop for individual action — to explain how position in a network shapes access, influence, and opportunity.

Type: Concept Domain: Social Science Mathematics Technology Era: 1967 — present

Overview

Key concepts include weak ties — acquaintances rather than close friends often provide the most novel information — structural holes, which give brokers bridging disconnected groups a critical strategic advantage, and degree centrality, which determines how fast information spreads. Mark Granovetter's research showed that job seekers typically learn about positions through distant acquaintances, with direct implications for labor economics and inequality.

Why it matters

By connecting sociology to mathematics through graph theory, social network theory created a shared analytical language that enables epidemiologists to model disease spread, computer scientists to optimize distributed systems, and organizational researchers to diagnose communication bottlenecks using identical tools.

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