Social Networks

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Social Networks

• Fall 2006

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Announcements

• Section today CPM 207
• MySpace assignment next week
• Expect to be interviewed by soc91ers
• Next weeks classes as office hours
• Attend all sections or do two books (lists on
  Wednesday)
• Grading A/B on revision. Due Monday two weeks.

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Social Networks are Familiar

• my support network
• my crew
• my extended family
• the grapevine, gossip network
• Cocktail parties as networking
• MySpace, Facebook, etc.
• Networks of suppliers in industry
• al qaeda

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(No Transcript)
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Patterns of Political Book Buying in 2003 America
http//www.orgnet.com/leftright.html
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International Hyperlinks
George A. Barnett Department of
Communication School of Informatics State
University of New York at Buffalo Buffalo, NY
14260 USA gbarnett_at_buffalo.edu
http//www.insna.org/Powerpoints/George.Barnett.pp
t
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Path Followed by Internet Petition
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American Airlines Petition
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Definitions

• A network is a collection of objects or entities
  and the connections or relationships among them.
• A social network is a set of social actors and
  the relationships or interactions among them.

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Networks Nodes Ties

• Nodes
• Actors
• Points
• Vertices
• Agents
• Players
• Ties
• Edges
• Links
• Relations
• Connections

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Nodes

• Individuals (persons)
• Collectives (organizations, states, communities)
• Objects (books, ideas, words)

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Node
Edge/Tie
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Two Ways to Think about Networks
EGO Network what is the network of a particular
actor?
Entire Network what is the full pattern of
connections in a population?
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First Ego Networks
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How do we describe egos world?
EGO
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Whats the difference between the nodes on the
right and the nodes on the left?
EGO
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Who is more likely to be able to supply a fresh
face for a date on Friday? Why?
EGO
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Why are the orange nodes more likely to have info
on a new job for you?
EGO
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Total Networks
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What do we notice about this network?
D
A
B
E
C
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More familiar now? How far apart are nodes?
B
A
D
E
C
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What is shortest path from A to D?
B
A
D
E
C
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What is shortest path from C to D?
B
A
D
E
C
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Shortest Paths
Average Path 16/10 1.6
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Take Away One Link
B
A
D
E
C
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Shortest Paths
Average Path 20/10 2.0
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Ties

• Kinship (who is a cousin)
• Role based (who is whose boss)
• Affective (who likes whom)
• Cognitive (how do you think about whom)
• Interactions (with whom do you do what)
• Proximities (what is near what (in various
  spaces))
• Shared attributes (who also wears black)
• Diverse Examples
• Reports to, is a unit of, task sharing, helping,
  informing, gossip, trust, respect, dislike,
  harassment, bullying, sells to, outsources to,
  regulates, interlocking directorates, personnel
  flows, joint ventures, alliances

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Example Viral Marketing

• __________________________________________________
  _______
• Do you Yahoo!?
• Get on board. You're invited to try the new
  Yahoo! Mail.
• ------------------------------------------
  --

__________________________________________________
_______ Windows Live Spaces is here! Its easy to
create your own personal Web site.
http//spaces.live.com/signup.aspx
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After Borgatti
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http//www.insna.org/INSNA/na_inf.html
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(No Transcript)
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History

• Simmel web of group affiliations (c. 1900)
• 1934 Jacob Moreno sociometry