The Internet and technologies have increased gambling opportunities globally, normalizing gambling among young individuals. Youth are active Internet users and susceptible to group norms, but little is known about group behavior and norms in online interaction. This study examined if following perceived majority opinions about gambling content (i.e., gambling norms) in online interaction is associated with youth problem gambling. Participants were 15–25-year-old youths in Finland (n = 1200; 50% female), South Korea (n = 1192; 50.42% female), Spain (n = 1212; 48.76% female), and the United States (n = 1212; 50.17% female). The participants took an online survey including a vignette experiment. In the vignette experiment, half of the participants were assigned to an in-group condition. The participants saw simulated gambling-themed social media messages with manipulated majority reactions. Norm conformity online was assessed using a within-person calculation. Norm conformity online was associated with youth problem gambling in all countries. In South Korea, this association was moderated by in-group norm source. The results indicate that young people who engage in problematic gambling may be more susceptible to conforming to perceived gambling norms online, but cultural differences exist. Intervention strategies should utilize educative online programs providing young problem gamblers accurate information about gambling.

互联网和技术在全球范围内增加了赌博机会，使年轻人中的赌博正常化。青年是活跃的Internet用户，容易受到群体规范的影响，但是对于群体行为和在线互动规范知之甚少。这项研究调查了以下关于在线互动中关于赌博内容（即赌博规范）的多数看法是否与青少年问题赌博有关。参加者为芬兰（n  = 1200；女性50％），韩国（n  = 1192；女性50.42％），西班牙（n  = 1212；女性48.76％）和15岁至25岁的青年（ñ = 1212; 女性占50.17％）。参与者进行了包括小插图实验在内的在线调查。在小插图实验中，一半的参与者被分配到小组条件下。参与者看到了以赌博为主题的模拟社交媒体消息，其中包含受操纵的多数反应。在线规范符合性是使用个人计算进行评估的。在线规范符合性与所有国家的青少年赌博问题有关。在韩国，该关联由小组内部规范来源主持。结果表明，从事有问题的赌博的年轻人可能更容易遵守在线感知的赌博规范，但存在文化差异。干预策略应利用教育性在线程序，为年轻的问题赌徒提供有关赌博的准确信息。