This cohort study examined longitudinal changes in undergraduates' use of social media as information sources in academic and everyday-life contexts, covering types of social media used, purposes of use, and evaluation strategies. Web surveys were used, collecting data from 1,355 and 928 undergraduates in 2013 and 2019. The study found that students used most types of social media less in 2019 than 2013 in both contexts. Only media-sharing services bucked this downward pattern. Overall, a majority of social media types underwent changes in the top three purposes of use. The 2019 cohort used most evaluation strategies more frequently in both contexts. However, they favored simplistic strategies relying on superficial physical cues when evaluating information. Based on the findings, this study provided recommendations for information literacy education and interface design, such as covering multimedia information evaluation, leveraging various heuristics to prime careful use of social media and analytical evaluation of information.

这项队列研究调查了本科生将社交媒体用作学术和日常生活环境中的信息来源的纵向变化，涵盖所使用的社交媒体类型、使用目的和评估策略。使用了网络调查，收集了 2013 年和 2019 年 1,355 名和 928 名本科生的数据。该研究发现，在这两种情况下，学生在 2019 年使用大多数类型的社交媒体的次数都少于 2013 年。只有媒体共享服务才能扭转这种下降趋势。总体而言，大多数社交媒体类型的前三个使用目的都发生了变化。2019 年的队列在这两种情况下都更频繁地使用了大多数评估策略。然而，他们倾向于在评估信息时依赖表面物理线索的简单化策略。根据调查结果，