Presentation on theme: "Chapter 4 This Hurts Me As Much As It Hurts You Multiplexity Multiplexity: the tendency to have several kinds of relationships (or many kinds) with the."— Presentation transcript:
Multiplexity Multiplexity: the tendency to have several kinds of relationships (or many kinds) with the same person…. Your friend is also your co-worker and your lover Photo by Barbara Doduk Photo by Nick Slide
Sexual Networks Sexual networks are helpful in the study of social networks because having sex with someone is a deliberate and detectable type of social tie.
Not a Pretty Picture In a wealthy suburb of Georgia there was an outbreak of syphilis and other STDs among teenagers (and preteens!). A large group of sexually active youth participating in casual and group sex was discovered. Photo by Shreyas, Flikr
Epidemic of Attitude The STDs are a reflection of a network process: the spread of a norm among teenagers -- that casual sex is acceptable It was an epidemic of attitudes with the symptoms being STDs Photo by Jo Carter Its acceptable perception spreads
The Networks Role At the core of the STD network were a few white, 15-year-old girls who would have group sex with clusters of boys This would connect many groups that would normally never be linked (facilitating the flow of the STD) Efforts to address the problem targeted and splintered the core, changing the network Core Girls Group 1 Group 2 Group 4 Group 3
High School Sex Networks High School Sexual Networks follow 2 basic principles: 1.Homophily Principle: people resemble their partners (race, grade, etc) 2.The Rule: Dont date your old partners current partners old partner. CONFUSING?! --Basically no-partner swapping with friends and exes Photo by Max Khokhlov Photo by Jill Greenseth Photo by K Akagami
The Spread of Contagion The more paths that connect you to other people in your network, the more susceptible you are to what flows within it.
STDs and Race Ed Laumann and his colleagues observed: Whites with many sexual partners tend to have sex with other whites with lots of partners Whites with few partners have sex with whites with few partners Blacks with many partners have sex with blacks with BOTH few and many partners STDs are held in the core of active white partners but spread to the periphery of the black population
The Obesity Epidemic Your Friends Friends Can Make You Fat Photos by Colin Rose and Sherrie G
The Obesity Epidemic 66% of Americans are overweight or obese From 1990 to 2000, the percentage of obese people in the USA increased from 21% to 33% 1975 1990 Green Node: nonobese Yellow Node= obese (size of circle is proportional to BMI)