Paul Resnick's Occasional MusingsPaul Resnick's Occasional Musings - LiveJournal.comHow newsgroups refer to NetScan data- June 29, 2007 Reflections and Reactions to Social Accounting Meta-Data. Eric Gleave (U of Washington) and Marc Smith (Microsoft Research). At C&T.In 18 months, there were about 5000 messages that explicitly referred to "netscan.research". Analyzedcoded 952 messages.Basic findings: Half discuss groups. 80% of those linking to the Netscan report card for the group, 17% explicitly discuss the group's "health". 22% discuss the message's author, such as saying that the author is 1 in the group. 31% discuss...http://presnick.livejournal.com/19024.html Rhythms of social interaction at Facebook- June 29, 2007 Rhythms of social interaction: messaging within a massive online network. Scott A. Golder, Dennis M. Wilkinson and Bernardo A. Huberman (HP labs).Scott Golder presenting at C&T. Log analysis of Facebook messaging patterns, from 496 North American universities.The college weekend goes Friday noon to Sunday noon. Message traffic follows the same pattern Mon-Thurs. Friday morning is same as Mon-Thurs. morning. Sunday afternoonevening is same as Mon-Thurs. Saturday all day, plus Friday PM and...http://presnick.livejournal.com/18792.html Group Formation in Large Social Networks- June 28, 2007 L. Backstrom, D. Huttenlocher, J. Kleinberg and X. Lan. "Group Formation in Large Social Networks: Membership, Growth, and Evolution", Proceedings of KDD 2006.Datasets on membership in LiveJournal groups and explicit "friend" relationships; and on publishing in conferences and explicit citations between authors.Question 1: How does the probability of joining a group depend on the friends who are already in itA: 'The data suggest a law of diminishing returns at work, where having additional...http://presnick.livejournal.com/18473.html Kraut: Developing Commitment Through Conversation- June 28, 2007 Today I'm at the Communities and Technologies conference, at the workshop on studying interaction in online communities.Bob Kraut is discussing some of the data analysis issues in his study in Usenet newsgroups of what independent variables predict whether a message would get responded to.They first did some machine learning techniques to identify the signature of messages that have a "self-introduction". Then they used that as a regressor, along with some directly measurable variables like...http://presnick.livejournal.com/18337.html Collusion-resistant, Incentive-compatible- June 17, 2007 At EC-07, Radu Jurca presented a paper extending work on eliciting honest ratings to consider situations where a set of players may collude to increase their payments for ratings. The setting is the same as that of my paper with Nolan Miller and Richard Zeckhauser, on the "The Peer Prediction Method". That is, a set of raters are scored based on comparing their reports to the reports of other raters-- there is no ultimate ground truth of whether the item is "good" that can be used to evaluate..http://presnick.livejournal.com/18026.html Recommenders and Sales Diversity- June 14, 2007 At the EC '07 conference, Kartik Hosanagar presented a paper modeling the impact of recommender systems on sales diversity. Do they contribute to a long tail, where lots of products get a few sales, or do they reinforce blockbusters. The paper suggests the latter.There are actually two effects that we should expect from recommenders. One is discovery-- once one person discovers an item, some other people with similar tastes who would not have found that item do find it. The other is...http://presnick.livejournal.com/17768.html |