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Exposure to carefully selected information on social networking sites (SNSs) showing a flawless self and an ideal life has been found to harm young individuals' self-esteem and well-being. However, SNS use is no longer limited to young people. Fueled by the sharp increase of smartphone ownerships, which allow users to access information about others anytime and anywhere, nowadays, a wide range of age groups uses SNSs. Accordingly, this study investigated the relationships between mobile SNS use, upward social comparison, self-esteem, and well-being for the first time. We employed a two-wave panel survey (NT2 = 461) using a quota sample of adults. Results revealed that Facebook use predicted upward social comparison, which harmed individuals' self-esteem and well-being over time, while Instagram use directly influenced well-being negatively over time. Additionally, we found support for reciprocal relationships between upward social comparison on SNSs and selfesteem as well as well-being in a longitudinal context.

The present study investigates how excessive smartphone use predicts users' stress and loneliness while taking the moderating role of online self-disclosure into account. We conducted a two-wave panel survey with a quota sample of smartphone users (n = 461 at time 2 [T2]). We found no direct effects of excessive smartphone use on stress or loneliness. However, our results showed that online self-disclosure moderates the postulated relationships. That is, excessive smartphone use (time 1 [T1]) predicts increased stress (T2), for those smartphone users who do engage in little online self-disclosure. However, for those who communicate their feelings, anxieties, and problems online, excessive smartphone use (T1) can even reduce loneliness (T2) and relieve stress (T2).

Communicative and passive online use have been shown to affect individuals' well-being in opposite ways. While communicative use is often associated with beneficial outcomes, passive use may even harm individuals' well-being. However, existing studies have paid insufficient attention to the influence of age on these associations. Additionally, little evidence is available regarding the impact of communicative and passive smartphone use on individuals' well-being across the lifespan. Drawing upon the theoretical approaches of Socioemotional Selectivity Theory, Social Convoy Model, and Social Compensation Hypothesis, we assumed that particularly communicative smartphone use may be beneficial for older adults' well-being, helping them to maintain their personal relationships. Results of a two-wave panel survey (N T2 = 461) revealed a significant negative influence of passive smartphone use on well-being irrespective of age. In line with the Socioemotional Selectivity Theory and Social Compensation Hypothesis, communicative smartphone use, however, only had a positive influence on well-being for adults older than 63 years, but not for younger adults. Our findings contribute to a broader understanding of the consequences of different types of smartphone use on well-being across generations in the longitudinal context.

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