Link creation and profile alignment in the aNobii social network
Luca Maria Aiello, Alain Barrat, Ciro Cattuto, Giancarlo Ruffo,, Rossano Schifanella

TL;DR
This paper analyzes the structural and dynamic properties of the aNobii social network, focusing on how profile similarity influences link creation and how social links promote profile alignment among users.
Contribution
It provides an in-depth longitudinal analysis revealing reciprocal causal relationships between profile similarity and social link formation in aNobii.
Findings
Profile similarity drives link creation
Social links promote profile alignment
Reciprocal causal relationship between profiles and links
Abstract
The present work investigates the structural and dynamical properties of aNobii\footnote{http://www.anobii.com/}, a social bookmarking system designed for readers and book lovers. Users of aNobii provide information about their library, reading interests and geographical location, and they can establish typed social links to other users. Here, we perform an in-depth analysis of the system's social network and its interplay with users' profiles. We describe the relation of geographic and interest-based factors to social linking. Furthermore, we perform a longitudinal analysis to investigate the interplay of profile similarity and link creation in the social network, with a focus on triangle closure. We report a reciprocal causal connection: profile similarity of users drives the subsequent closure in the social network and, reciprocally, closure in the social network induces subsequent…
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