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Social Computing Techniques - Coggle Diagram
Social Computing Techniques
Past and Present
Timeline
1714
Longitude Prize
1791
Gaspard de Prony' Logarithm Tables
1906
Galton's Ox
1986
Challenger Crash
Early Social Computing Systems
1992
Tapestry, GroupLens
1995
eBay
1995
Amazon
1998
Google
2005
Youtube
2001
Wikipedia
Definition Nuances
Collective Intelligence
Social Computing
Human Computation
Crowdsourcing
Social Computing vs Traditional Compting
Recommender Systems
Filter Bubble Problem
Recommender vs information filtering systems
Paradigms
Content-based
Knowledge-based
Collaborative Filtering
Hybrid
Similarity Techniques
Dice's Coefficient
Jaccard's Coefficient
Cosine Similarity
Adjusted Cosine Similarity
Slope One
Collaborative Filtering Paradigms
Item-based
User-based
Explicit vs Implicit Ratings
Evaluation
Online Tests
(sales, CTR)
Laboratory Studies
(user satisfaction)
Offline Experiments
(prediction accuracy, coverage)
Metrics
F1, Precision, Recall, Accuracy
Rank Score
MAE, RMSE
Reputation Systems
Misc
Asymmetric Information
Gresham's Law
Adverse Selection
Market Failure
Moral Hazard
Trust vs Reputation
3 Trust issues on web
Recommender vs Repuation Systems
Lemon Problem
Values
Reputation Value
Average Rating
Average corrected for bias
Weighted Ratings
Maximum Likelihood
Confidence
Number of ratings
Variance of ratings
Preicion of ratings (1/variance)
Evaluation
Theoretical Models (game theory)
Field Experiment
Problems
Ballot Stuffying
False/Unfair Ratings
Whitewashing
Reciprocation and Retaliation
Individual Bias
Temporal Quality Variations
Rating Incentive
Human Computation
Suitable Task Qualities
Easily and quickly explained to non-experts
Fast to complete
Amenable to automatic quality control + aggregation
Robust to some noise
Ethical?
Soylent: Problem + Solution
Turkit
Voting
Majority Vote
Weighted Voting
Weighted Voting with Prior Knowledge
Expectation Maximisation
Expectation Maximisation (with Gold Standard Data)
Crash-and-Rereun Pattern
Incentives
Motivations
Financial Reward
Self-development
Enjoyment
Altruism
Social Aspects
Intrinsic vs Extrinsic Motivations
Studies
Deci, 1971
Intrinsic motivation decreased by financial reward
Rustichini, 2000
Pay enough, or not at all
Mason & Watts, 2009
Pay increases output volume, not quality
Anchoring Effect
Volunteers vs Paid Workers
Social Mobilisation
Gamification
Output-Agreement
Input-Agreement
Badges, Leaderboards, Progress Bars
Non-Monetary Incentives
Expert Crowdsourcing
Expert vs Human Crowdsourcing
Contests
Styles
Multiple Rounds
Multiple Prizes
Iterative Feedback
Task Choice
TaskCN Study
Small user pop gets most of rewards
Workers behave strategically
Early experience critical
Inefficient
Online Learning
(Expert Selection)
e-greedy
e-first
Thompson Sampling
Online Auctions
Styles
English Auctions
Dutch Auctions
Sealed-Bid First Price
Vickrey Auctions
Analysis
Utility Theory
Strategic Equivalence
Revenue Equivalence Theorem
4 Assumptions
Problems
Winner's Curse
Bidder Collusion
Corruption
Sniping
Sponsored Search
Simple Approach
Google's Quality Score
First-Price Auctions vs Generalised Second -Price Auctions
Properties
Rank Aggregation
Approaches
Plurality Voting
Borda Count
Black's Rule
Copeland Method
Distance Measure-based Aggregate Rankings
Condorcet
Condorcet Paradox
Condorcet Criterion
Condorcet Winner
Condorcet Consistent
Condorcet Methods
Distance Measures
Spearman's Footrule Distance
Kendall-Tau Distance
Experimental Design
Approaches
A-B Testing
Multivariate Testing
One-factor-at-a-time (OFAT)
Full Factorial Design
Fractional Factorial Design
Latin Squares
Main vs Interaction Effects