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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 l.jpg

Computer-Mediated Communication

Collaborative Editing, Online Collective Action and Game Theory


Announcements l.jpg
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


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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


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“… [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


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“Talk” Pages on Wikipedia 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


Emergent order and coordination l.jpg
“Emergent” Order and Coordination elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

Computer-Mediated Communication — Cheshire & Fiore


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Designing for Social Psychological Incentives elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

Outcomes for Collective Action

Contribution

Size

Membership

Diversity of

Contribution

Standardization

Behaviors

Social psychological incentives

Computer-Mediated Communication — Cheshire & Fiore


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Using Game Theory to Understand Collective Action elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

Computer-Mediated Communication — Cheshire & Fiore


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Types of Social Dilemmas elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

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


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When are Social Dilemmas Useful in the Study of CMC? elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

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


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Public Good elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

Forms of Interaction in Social Dilemmas

N-person PD

2-person repeated PD

Computer-Mediated Communication — Cheshire & Fiore


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The N-person PD elements seem to be growing at a faster pace than the bulk of articles in the encyclopedia [Wikipedia]”

“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


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Vaccinations, Invisible Hands, Halloween Parties and other Scary Things.

Computer-Mediated Communication — Cheshire & Fiore


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2-person repeated PD Scary Things.

“…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


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C C C C C C C C C = 0 Scary Things.

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


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Strategizing in repeated PD games Scary Things.

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


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CMC PD tournament 2008! Scary Things.

Computer-Mediated Communication — Cheshire & Fiore


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CMC PD tournament 2008! Scary Things.

  • 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


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Tournament format Scary Things.

  • 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


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Software details… Scary Things.

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

Computer-Mediated Communication — Cheshire & Fiore


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Software details… Scary Things.

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


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Software details… Scary Things.

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


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