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Lecture 19

# Lecture 19 - clusters within social networks o If you talk...

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Lecture 19: The Small World (continued) 12/1/2010 Mathematical explanation -Diagram (bulls eye) -If everyone has a certain number of contacts (say, 100) in their social network, and their contacts do as well, then a given person’s network will span outward and reach everyone in the world within a few days -Looks more like diagram 2 (different clusters) -Problem—people will overlap (clusters), so you don’t get to 10 billion people at 5 steps -Social networks are highly organized, not random - Small world paradox: How can a highly clustered society also have short average path lengths between strangers? A solution -Diagram -Add random ties between clusters, average path length decreases The strength of weak ties Social ties vary in terms of strength (e.g., frequency of contact, emotional intensity, commitment) Strong ties tend to facilitate triadic closure, and therefore tend to create

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Unformatted text preview: clusters within social networks o If you talk to 2 people, they will form a weak connection (at least), form a new closed triad • Weak ties tend to impede triadic closure, and therefore extend beyond specific clusters o Ties within clusters are strong, so what makes the small world phenomenon possible is the presence of weak ties • Weak ties therefore increase the overall connectivity of social systems, thus increasing the rate at which things can diffuse through them (solution to small world paradox) The hubs solution-One person who is well connected or a few people, not everyone (the hub)-Similar to what Milgram found Why is the world small? Industrialization, Post-industrialization Specialization, _________ Post-modernity, Contact with weak ties, Bridging Rationalization globalization strangers between Urbanization clusters =Small world...
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