Zerozero88 Twitter URL Item Recommender

+University of Palo Alto Research Center! ^MIT CSAIL! Minnesota! 8/23/10 CHI2010 ZeroZero88.com 1

•  Social Information Streams! 8/23/10 CHI2010 ZeroZero88.com 2

8/23/10 CHI2010 ZeroZero88.com 3

Follower and Followee ! follows Follower Followees

URL Sources Topic Relevance Scores User Topic Profiles Social Network Scores Local Social Network Recommendation Engine  Multiply scores  Rank URLs using multiplied scores  Recommend highest ranked URLs

Component Possible Design Choices URL Sources FoF (followee-of-followees) Popular 8/23/10 CHI2010 ZeroZero88.com 9

Component Possible Design Choices Topic Relevance Self-Topic Scores Followee-Topic None 8/23/10 CHI2010 ZeroZero88.com 12

Component Possible Design Choices Social Network Social Voting Scores None 8/23/10 CHI2010 ZeroZero88.com 14

Component Possible Design Choices URL Sources FoF (followee-of-followees) Popular Topic Self-Topic Relevance Followee-Topic Recommendation Engine Scores None  Multiply scores Social Social Voting  Rank URLs using multiplied scores Network None  Recommend highest ranked URLs Scores 8/23/10 CHI2010 ZeroZero88.com 15

Component Possible Design Choices URL Sources FoF (followee-of-followees) Popular Topic Relevance Self-Topic Scores Followee-Topic None Social Network Social Voting Scores None (beta=0.22, Z=1.78, p=.08) 8/23/10 CHI2010 ZeroZero88.com 19

Component Possible Design Choices URL Sources FoF (followee-of-followees) Popular Topic Relevance Self-Topic Scores Followee-Topic None Social Network Social Voting Scores None (beta=0.58, Z=4.95, p<.001) (beta=0.27, Z=2.48, p=.01) 8/23/10 CHI2010 ZeroZero88.com 20

Component Possible Design Choices URL Sources FoF (followee-of-followees) Popular Topic Relevance Self-Topic Scores Followee-Topic None Social Network Social Voting Scores None (beta=1.02, Z=6.53, p<.001) 8/23/10 CHI2010 ZeroZero88.com 21

Component Possible Design Choices URL Sources FoF (followee-of-followees) Popular Topic Relevance Self-Topic Scores Followee-Topic None Social Network Social Voting Scores None 8/23/10 CHI2010 ZeroZero88.com 22

Algorithms Differ Not Only in Accuracy! !

Acknowledgements! •  ASC folks at PARC! •  All users of Zerozero88.com! •  My labmates at the University for helping me prepare the presentation! •  … and reach me at jilin@cs.umn.edu for questions!!

Zerozero88 Twitter URL Item Recommender

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