Spotting Trends: The Wisdom of the Few

Spotting TrendsThe Wisdom of the Few Xiaolan Sha◦ Daniele Quercia✦ Pietro Michiardi• Matteo Dell’Amico•

Our Work What are the trends one might be interested in?

What Is a Trend Popular ≠Trending

Who Create Trends ｝｛Inﬂuentials Trend Makers ED (upload) BIN OM ESS A C OC PRAccidental Trend Spotters (vote)

Our Context SP Te E CI c De hnol og AL sig n- y Co -Sav ns v cio y us

Our ContextA core group of users are main content contributors. 9,316 users, 6,395 items and 21,252 votes

Traditional item i p(u,i) = 1 if u likes i, otherwise 0 user u Items ALGORITHM Recommend Users Preference Matrix

Our Approach Trend Spotters Recommend Identify Trends Trends Trend Makers User Space Item Space Trend-aware Recommendation

A Special Few ? Features ｛ ActivityTrend SpottersTrend Makers Content Social Network SVM User Space Geography

A Special Few ? ｛ if uploaders are trend makers of any qualityTrends Logistic Regression Item Space if voters are trend spotters - only of high quality

Trend-aware trend i p(u,i) = 1 if u likes trend i user u SVD Recommend Trends Trends Trend Space Trend-aware Preference Matrix

Our Approach Trend Spotters Recommend Identify Trends Trends Trend Makers User Space Item Space Trend-aware Recommendation

Baseline item i p(u,i) = 1 if u likes i and item i is a trend, otherwise 0 user u Items ALGORITHM Recommend Users Preference Matrix

Evaluation Recall(N) = #hits / |T| Precision(N) = #hits / (N * |T|)

SummaryPopular ≠ TrendsTrend Spotters & Makers Exist ! Identify them improve therecommendation.

Spotting Trends: The Wisdom of the Few Xiaolan Sha, Daniele Quercia, Pietro Michiardi, Matteo Dell’Amico Thank You!

http://www.cl.cam.ac.uk	224
http://profzero.org	94
https://twitter.com	26
http://www0.cs.ucl.ac.uk	4
http://tweetedtimes.com	1

Spotting Trends: The Wisdom of the Few

by Daniele Quercia on Sep 15, 2012

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