AUTHOR=Ni Jinru , Fu Hongyu , Zhu Yajing , Li Zewen , Wang Shuyi , Su Haoran TITLE=Social media usage and cyberbullying: the moderating role of tie strength JOURNAL=Frontiers in Psychology VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2025.1490022 DOI=10.3389/fpsyg.2025.1490022 ISSN=1664-1078