SNS. Facebook SNS. Social Networking SNS 2015; 2012 SNS. Facebook 10 Christofides, Muise, & Desmarais, 2012a SNS SNS SNS SNS

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1 SNS 1 mixi 1,051 e.g., e.g., SNS Social Networking Service SNS 2015; 2012 SNS SNS SNS mixi Facebook SNS Facebook 10 Christofides, Muise, & Desmarais, 2012a SNS 23% SNS SNS SNS SNS

2 SNS 27 SNS SNS e.g., Debatin, Lovejoy, Horn, & Hughes, 2009; 2005 e.g., 2009; 2011 e.g., 2009 SNS Christofides, Muise, & Desmarais 2009, 2012b Facebook Facebook Santor, Messervey, & Kusumakar, 2000 Christofides et al., 2009, 2012b Christofides et al., 2012b 18 Christofides et al., 2012b SNS Taddicken, 2014 SNS Christofides et al. 2009, 2012b Taddicken 2014 SNS SNS SNS SNS SNS 2013, e.g., e.g., e.g., e.g., Multi-dimensional Privacy Scale for Internet users MPS-I 2011a MPS-I e.g., SNS Christofides

3 et al. 2009, 2012bFacebook SNS Christofides et al. 2012b 2011b e.g., SNS SNS SNS SNSmixi 2 mixi mixi , SNS SNS SNS SNS SNS Christofides et al. 2012b Facebook Facebook SNS SNS SNS goo NTT 3 40,000 URL 4 SNS 9,817 mixi 3 goo ,

4 SNS 29 1,800 URL 1, SD 10.07, Min 16, Max 73, Med 36.00, Mode 36, Skewness 0.47, Kurtosis a c mixi 6 a 7 mixi b 2013 MPS-I mixi mixi Santor et al., e.g., e.g., c mixi mixi , d mixi mixi mixi 5.29 SD % 10% mixi mixi SD 39.27, Min 0, Max 390, Med 15.00, Mode 5, Skewness 3.39, Kurtosis SD 82.78, Min 0, Max 999, Med 8.00, Mode 0, Skewness 6.97, Kurtosis

5 % % 0 Yamamura Table 1 N 1,051.73***.67***.02.08* ***.03.13*** ** *p.05, **p.01, ***p.001 M SD M 2.49, SD 2.50, Min 0, Max 8, Med 2, Mode 0, Skewness 0.61, Kurtosis0.88 α.85 Table 2 N 1,051.31***.30***.42***.27***.36***.27***.03.08*.06.09** *p.05, **p.01, ***p.001 Appendix 1 4 α.84 4 M 2.52, SD 0.88 r.26, p.001 MPS-I 10 α mixi 92 e.g., Kunnan, MPS-I 2013 MPS-I α.92 α.85 MPS-I M 3.94, SD 0.23 Table 1 Table mixi MPS-I MPS-I β.12, p.01

6 SNS 31 r.31, p.001 Table 2 MPS-I 11 Table 3 12 a 11 VIF VIF 2.50 e.g., Allison, a mixi Facebook Christofides et al. 2012b b c SNS d SNS e mixi mixi 2012 mixi f Table 3 N 1,051 β.27,.15, p.001 β.13,.08, p.05 b β.09,.11, p.01 SNS mixi SNS β 12.09**.01.07*.15*** mixi.04.13***.04.24***.16***.12**.27***.13***.15***.08*.03.09**.02.11** R 2 adj.25***.25*** *p.05, **p.01, ***p.001 β

7 Taddicken, 2014 Christofides et al. 2009, 2012b 13 SNS SNS SNS Debatin et al., Christofides et al. 2009, 2012b Facebook Christofides et al β.12, Christofides et al. 2012b 18 β.21β.16 Christofides et al. 2009, 2012b SNS SNS SNS SNS SNS SNS mixi SNS

8 SNS 33 SNS 2012SNS SNS SNS SNS SNS Allison, P. D. (1999). Multiple regression: A primer. Thousand Oaks, CA: Pine Forge Press , Christofides, E., Muise, A., & Desmarais, S. (2009). Information disclosure and control on Facebook: Are they two sides of the same coin or two different processes? Cyber Psychology and Behavior, 12, Christofides, E., Muise, A., & Desmarais, S. (2012a). Risky disclosures on Facebook: The effect of having a bad experience on online behavior. Journal of Adolescent Research, 27, Christofides, E., Muise, A., & Desmarais, S. (2012b). Hey mom, what s on your Facebook?: Comparing Facebook disclosure and privacy in adolescents and adults. Social Psychological and Personality Science, 3, Debatin, B., Lovejoy, J. P., Horn, A.-K., & Hughes, B. N. (2009). Facebook and online privacy: Attitudes, behaviors, and unintended consequences. Journal of Computer-Mediated Communication, 15, pdf mixi mixi.co.jp/2011/11/25/mixi-6.html mixi 23, SNS mixi 27, Kunnan, A. J. (1998). An introduction to structural equation modelling for language assessment research. Language Testing, 15, Santor, D. A., Messervey, D., & Kusumakar, V. (2000). Measuring peer pressure, popularity, and conformity in adolescent boys and girls: Predicting school performance, sexual attitudes, and substance abuse. Journal of Youth and Adolescence, 29, a b , MPS 23, SNS mixi 32 1, Taddicken, M. (2014). The privacy paradox in the social web: The impact of privacy concerns, individual characteristics, and the perceived social relevance on different forms of self-disclosure. Journal of Computer-Mediated Communication, 19,

9 SNS 34, SNS 2009-ICS- 154, Yamamura, K. (1999). Transformation using (x 0.5) to stabilize the variance of populations. Researches on Population Ecology, 41, Psychological Factors Affecting Disclosure of Personal Information in Social Networking Services Naoya Tabata 1) and Hirotsune Sato 2) 1) Aichi Gakuin University 2) Shinshu University The Japanese Journal of Personality 2016, Vol. 25 No. 1, Psychological factors affecting the disclosure of personal information in social networking services (SNS) were investigated. In a web-based survey, users of Mixi (N 1051), a popular Japanese SNS, were asked about their disclosure of personal information in their Mixi profiles and about psychological factors such as attitude toward information privacy. Results indicated that those with low information privacy regarding their demographics (e.g., sex) and personal identity (e.g., real name) were prone to sharing elements of their profiles with the general public and to expressing more about their inner self in their profiles. Need for popularity and risk perception about crime positively affected tendency toward expressing the inner self in their profiles. Key words: social networking service SNS, disclosure of personal information, information privacy Appendix 1%