The aim of the present study was to investigate differences between late (born: 1991–2000) and early (born: 1977–1990) Millennials regarding the personality traits narcissism, sensation seeking, self-esteem, and Facebook use. Furthermore, we investigated the relationship between personality traits and Facebook use, in both groups. Data of 254 Millennial Facebook users were collected. Results of regression discontinuity analyses including age as covariate indicate that late Millennials on average score significantly higher on narcissism, sensation seeking, self-presentation, and social interaction on Facebook than early Millennials. These cohort effects occur beyond age effects. In both groups, narcissism, sensation seeking, self-esteem, and online behavior were positively related. Interpretation of the results focuses on technological innovation and cultural change which affect the development of early and late Millennials differently. It is concluded that late and early Millennials differ substantially regarding personality traits and online behavior.

中文翻译：

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自恋的千禧一代：在Facebook上的人格特征和在线行为研究

本研究的目的是调查千禧一代（出生于1991–2000年）和早期（出生于1977–1990年）之间在人格特征自恋，寻求感觉，自尊和使用Facebook方面的差异。此外，我们调查了两组人格特征与Facebook使用之间的关系。收集了254位千禧一代Facebook用户的数据。回归不连续性分析（包括年龄作为协变量）的结果表明，在千禧一代中，自恋，寻求感觉，自我表现和社交互动方面的平均得分明显高于早期千禧一代。这些队列效应超出了年龄效应。在两组中，自恋，寻求感觉，自尊和在线行为均呈正相关。结果的解释着重于技术创新和文化变革，这些变革对千禧一代早期和晚期的发展产生不同的影响。结论是，千禧一代的晚期和早期在人格特征和在线行为方面存在很大差异。