Vassilis Kostakos
An empirical study of spatial and transpatial social networks using Bluetooth and Facebook.
Fri, 10/23/2009 - 14:26 — SomNambulAuthors: Vassilis Kostakos
Subjects: Computers and Society
AbstractThis study provides insights into the quantitative similarities, differences
and relationships between users' spatial, face-to-face, urban social networks
and their transpatial, online counterparts. We explore and map the social ties
within a cohort of 2602 users, and how those ties are mediated via physical
co-presence and online tools. Our analysis focused on isolating two distinct
segments of the social network: one mediated by physical co-presence, and the
other mediated by Facebook.Is the crowd's wisdom biased? A quantitative asessment of three online communities.
Wed, 09/02/2009 - 12:02 — SomNambulAuthors: Vassilis Kostakos
Subjects: Human-Computer Interaction
AbstractThis paper presents a study of user voting on three websites: Imdb, Amazon
and BookCrossings. It reports on an expert evaluation of the voting mechanisms
of each website and a quantitative data analysis of users' aggregate voting
behavior. The results suggest that voting follows different patterns across the
websites, with higher barrier to vote introducing a more of one-off voters and
attracting mostly experts. The results also show that that one-off voters tend
to vote on popular items, while experts mostly vote for obscure, low-rated
items.
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