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Computer-Mediated Communication. Collaborative Editing, Online Collective Action and Game Theory. Announcements. Assignment #2 and Due Dates Thurs Nov 13 th (Assn 2) Presentations Dec 2 nd and Dec 4 th Final Projects Due Tuesday December 16 th Next Week No Readings or Reviews

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computer mediated communication

Computer-Mediated Communication

Collaborative Editing, Online Collective Action and Game Theory

announcements
Announcements
  • Assignment #2 and Due Dates
    • Thurs Nov 13th (Assn 2)
    • Presentations Dec 2nd and Dec 4th
    • Final Projects Due Tuesday December 16th
  • Next Week
    • No Readings or Reviews
    • In-class activities
  • Office hours moved to 3-4pm today

Computer-Mediated Communication — Cheshire & Fiore

highlighting a few good points and issues
Highlighting a few good points and issues:
  • Who is the target audience in a collective action problem?
    • NPR example
  • Incentives and “crowding out” effects
    • Monetary versus other incentives
  • Mycroft: Heinlein vs. Conan Doyle

Computer-Mediated Communication — Cheshire & Fiore

slide4

“… [we] note that administrative and coordinating elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

Viégas et al. 2007

Computer-Mediated Communication — Cheshire & Fiore

talk pages on wikipedia
“Talk” Pages on Wikipedia

(Viégas et al. 2007)

Computer-Mediated Communication — Cheshire & Fiore

emergent order and coordination
“Emergent” Order and Coordination

Computer-Mediated Communication — Cheshire & Fiore

designing for social psychological incentives
Designing for Social Psychological Incentives

Outcomes for Collective Action

Contribution

Size

Membership

Diversity of

Contribution

Standardization

Behaviors

Social psychological incentives

Computer-Mediated Communication — Cheshire & Fiore

using game theory to understand collective action
Using Game Theory to Understand Collective Action

Computer-Mediated Communication — Cheshire & Fiore

types of social dilemmas
Types of Social Dilemmas

Different social dilemma games

make different use of the payouts:

T>R>P>S Prisoner’s Dilemma

T>R>S>P Chicken

T>P>R>S Deadlock

R>T>P>S Stag Hunt

B

3 (R)

5 (T)

0 (S)

Reward

Temptation

Sucker

Punishment

3 (R)

A

0 (S)

1 (P)

5 (T)

1 (P)

Computer-Mediated Communication — Cheshire & Fiore

when are social dilemmas useful in the study of cmc
When are Social Dilemmas Useful in the Study of CMC?

Standards Wars

And Intperpersonal

Interactions

Online Tagging Systems (folksonomies), Collaborative Editing Systems

Wherever we find mixed-motive situations and collective action…

Del.ic.ious

Computer-Mediated Communication — Cheshire & Fiore

forms of interaction in social dilemmas

Public Good

Forms of Interaction in Social Dilemmas

N-person PD

2-person repeated PD

Computer-Mediated Communication — Cheshire & Fiore

the n person pd
The N-person PD

“No one wants to pay taxes because the benefits are so diffuse and the costs are so direct. But everyone may be better off if each person has to pay so that each can share the benefits”

cf. Schelling 1973; Axelrod 1984

Computer-Mediated Communication — Cheshire & Fiore

vaccinations invisible hands halloween parties and other scary things
Vaccinations, Invisible Hands, Halloween Parties and other Scary Things.

Computer-Mediated Communication — Cheshire & Fiore

2 person repeated pd
2-person repeated PD

“…there are many opportunities for mutually rewarding activities by two senators. These mutually rewarding actions have led to the creation of an elaborate set of norms…among the most important of these is the norm of reciprocity [helping out a colleague and getting repaid in kind]”

- Axelrod 1984

Computer-Mediated Communication — Cheshire & Fiore

slide15

C C C C C C C C C = 0

versus

D D D D D D D D D = 45

C C C C C C C C C = 27

versus

C C C C C C C C C = 27

B

3 (R)

5 (T)

0 (S)

3 (R)

A

0 (S)

1 (P)

5 (T)

1 (P)

Computer-Mediated Communication — Cheshire & Fiore

strategizing in repeated pd games
Strategizing in repeated PD games

What strategy might you use if you had to play this game over and over again with others?

Always Cooperate?

Always Defect?

Something more complicated, perhaps using past behavior?

  • Consider two individuals who interact repeatedly over time
      • No mechanisms for enforceable commitments.
      • No way to be sure what the other will do on each ‘turn’.
      • No way to eliminate the other player or leave the interaction.
      • No way to change the other player’s payoffs.

Computer-Mediated Communication — Cheshire & Fiore

cmc pd tournament 2008
CMC PD tournament 2008!

Computer-Mediated Communication — Cheshire & Fiore

cmc pd tournament 200818
CMC PD tournament 2008!
  • Work in groups to develop PD strategies
  • Use IPDLX open-source PD software
    • Used for tournaments by PD “professionals”
    • Works with Java 1.4, 1.5, 1.6, any platform
  • Tournament will be in class on Tuesday —Actually, TWO tournaments:
    • One where you enter your one best strategy
    • One where you enter any and all strategies

Computer-Mediated Communication — Cheshire & Fiore

tournament format
Tournament format
  • Round-robin: each strategy plays each other strategy and itself once
    • Winner has the most cumulative points
  • Each game will have n turns
    • n is unknown and potentially variable

Computer-Mediated Communication — Cheshire & Fiore

software details
Software details…

http://courses.ischool.berkeley.edu/i216/f08/ipdlx08.zip

Computer-Mediated Communication — Cheshire & Fiore

software details21
Software details…

public class CMCSample extends Strategy {

private final static String _abbrName = "CMCS";

private final static String _name = "CMC Sample Strategy";

private final static String _description = "Not a proper strategy...";

...

Computer-Mediated Communication — Cheshire & Fiore

software details22
Software details…

public double getMoveDecision() {

// Default move

double move = COOPERATE;

// Do some magic ...

// ... end magic.

// Return your move for this round

return move;

}

Computer-Mediated Communication — Cheshire & Fiore