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The Bucket Brigade

The Telephone Tree

The Military Squad

Dyads agglomerate to formlarge interconnected webs

The simplest natural network is a dyad or pair

Finding Mr./Ms. RightHow Many Dates Does it Take?

2 in 32 in 3

Obesity in Framingham

Causes of Clustering

False positive Homophily(selection effects)

Contextual effects (omitted variables)

Influence (induction)

Results

Happiness in Happiness in FraminghamFramingham

Friend, Spouse Ties Sibling Ties

Unhappy Neutral Happy

• Women Men

Three Degrees of Influence•Obesity•Smoking•Happiness•Loneliness•Drinking•Depression•Cooperation•Piano teacher referrals•Inventor ideas

Three Reasons for Three Degrees

Network Instability

Evolutionary Purpose

• Homo Sapiens (150)

Intrinsic Decay

Twins!

How Do We Take Our Natural Social

Networks Online?

SmilersSmilersNonNonSmilersSmilers

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Acknowledgements

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Images: Wikipedia, FEMA, aussiegall, Ramona.Forcella, quinet, moggs oceanlane, Flickr