Social Networks Beveridge and Shian (2016) Social contagion

Social Networks Beveridge and Shian (2016) Social contagion

Social Networks Beveridge and Shian (2016) Social contagion

deas, information and behaviour spread hrough networks like diseases

Diffusion domain Diffusion mechanic

Yahoo! Kindness

Describe an act of kindness and share with contacts. Zync

Video sharing receiver has to adopt service to view video

Secretary game Player to player sharing

Twitter news stories Link posting and onward sharing

Twitter videos Link posting and onward sharing

Friend Sense Facebook app: player to player sharing

Yahoo Voice Sharing over Yahoo IM network

Goel et al (2012) 3%

1% 0.3% Influences by Cascade Type

0.1% 100% A

Density (Adoptions) 0.03% 30% 10%

All Else Y! Kindness

Zync Secretary Game 3%

Twitter News 1%

Twitter Videos 0.3% 0.1%

Friendsense B

C 0.03%

Y! Voice Y! Kindness Zync

All Else Secretary Game

Twitter News Goel et al (2012)

Twitter Videos Friendsense 12

"the majority of all humans who have ever been infected with avian inuenza were infected during a single event, namely the 1918 pandemic, during which

more than 500 million individuals are thought to have been infected" By contrast, only around 10% of online adoptions - succesful inuences - are

found within large cascades. Special People

Experiment Data Simulation

Flickr: amylovesyah Neighbourhood Networks

Flickr: w A satised agent is one that is surrounded by at least x %(here: 30%) of agents that are like itself.

When an agent is not satised, it moves to a randomly chosen vacant location on the grid. Buzz

Where are our blind spots and what is our received wisdom about complex network phenomena? How do we characterise behaviour in the networks

we are interested in? Where we know we dont know, do we have - or can we collect - data? If data is limited, what can we simulate?

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