@techreport{oai:ipsj.ixsq.nii.ac.jp:00096121,
 author = {Lin, Gu and Basilisa, Mvungi and Mizuho, Iwaihara and Lin, Gu and Basilisa, Mvungi and Mizuho, Iwaihara},
 issue = {4},
 month = {Nov},
 note = {Private information is sometimes unintentionally disclosed to the public in Social Network Services (SNSs), leading to great concern on users' privacy settings. In order to guide SNS users for their appropriate privacy settings, measures for evaluating privacy attitude of users have been proposed. However, the existing measure of privacy score, which utilizes the item response theory (IRT), only considers whether each privacy attribute is disclosed or not and does not consider the activity level of the attribute, which is a quantitative indicator of how much amount the user published on the attribute. In this paper, we first analyze the relationships between the original privacy score and user activity levels. After confirming the relationships between them, we propose activity privacy score using user activity levels. With the activity privacy score, we can group SNS users by their behavior and improve the original privacy score model., Private information is sometimes unintentionally disclosed to the public in Social Network Services (SNSs), leading to great concern on users' privacy settings. In order to guide SNS users for their appropriate privacy settings, measures for evaluating privacy attitude of users have been proposed. However, the existing measure of privacy score, which utilizes the item response theory (IRT), only considers whether each privacy attribute is disclosed or not and does not consider the activity level of the attribute, which is a quantitative indicator of how much amount the user published on the attribute. In this paper, we first analyze the relationships between the original privacy score and user activity levels. After confirming the relationships between them, we propose activity privacy score using user activity levels. With the activity privacy score, we can group SNS users by their behavior and improve the original privacy score model.},
 title = {Tracking topics on revision graphs of Wikipedia edit history},
 year = {2013}
}