How to prevent side effects of social media use (SMU)? Relationship between daily stress, online social support, physical activity and addictive tendencies – A longitudinal approach before and during the first Covid-19 lockdown in Germany

People who experience high levels of daily stress often resort to intensive social media use (SMU). In the short-term, this can contribute to relief and positive emotions. However, in the longer-term, intensive online activity can foster addictive tendencies. The present longitudinal study investigated the association between daily stress and addictive SMU. Data were assessed in a sample of 211 social media users (Mage (SDage) = 22.50 (5.00)) from Germany via online surveys at two measurement time points in winter 2020 (baseline, BL), and three months later in spring 2020 during the first Covid-19 lockdown (follow-up, FU). In moderated mediation analyses, the positive relationship between daily stress (BL) and addictive SMU (BL) and (FU) was significantly mediated by the level of perceived online social support (BL). Physical activity (BL) (e.g., jogging and cycling) significantly moderated the relationship between online social support (BL) and addictive SMU (BL) and (FU). Specifically, the association between both variables was significant for medium and low frequency of physical activity, but not for high frequency. The mostly female and relatively young sample composition limits the generalizability of the present findings. No experimental manipulation of the potential predictors of addictive SMU was introduced limiting the causal interpretation of the current results. The current findings disclose mechanisms that could reduce the risk of addictive SMU. Specifically, a conscious increase of physical activity could prevent the transformation of positive emotions evoked by the perception of online social support into addictive tendencies.