“…We included different SNSs (e.g., Facebook, Twitter) and media use activities (e.g., texting, commenting, emailing). However, to narrow the scope and strengthen interpretability, we only selected for relatively active but general uses of SNSs in everyday life (i.e., profile updates, chatting, instant messaging, emailing, posting, and commenting) as measured by frequency (e.g., Use of Facebook Questionnaire [UFQ] from less than once a day to three or more times a day [21]; never to very frequently [20]) or duration (e.g., not at all to more than 10 hours a day on a "typical day" [34]). That means that we excluded studies in a specific setting such as in an educational context (e.g., assessing course discussion boards [35]), only assessed specific forms of exposure (e.g., prosocial or antisocial media; for a review see [25]), cyberbullying [36], or manipulated use [37].…”