In this study, we analyzed >200,000 posts collected from Facebook public pages that were published in December 2020 during the rollout of the first dose of the Pfizer-BioNTech vaccine to the American public. We ran both topic modeling and sentiment analysis of the posts and found that first Facebook posts talked about not only treatment effectiveness such as trial results and testing approaches but also other issues that surround vaccines such as approval and distribution. Second, although the general sentiment during this period was positive and anticipation was the highest emotion, Facebook posts expressed a salient amount of fear and sadness, especially when discussing emergency approval and trial results. Finally, we found that both topics and sentiments have a significant influence on user likes. Using the topic of vaccine distribution as a baseline, posts that discuss related aspects of vaccines (e.g., effectiveness, shipment, and testing), call for actions (e.g., use of masks) and indicate care to vulnerable groups (e.g., health care workers and seniors) received more likes. Posts with bad news (e.g., new cases and deaths) and doubts over the usefulness of vaccines received fewer likes. Regardless of their valences, approach emotions lead to more likes whereas withdrawal emotions lead to fewer likes. Our study suggests that to facilitate actions, using certain topics and approach emotions in the posts could be helpful.

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话题和情绪影响点赞数：Facebook 公共页面关于 COVID-19 疫苗接种的帖子研究

在这项研究中，我们分析了从 2020 年 12 月向美国公众推出第一剂辉瑞-BioNTech 疫苗期间发布的 Facebook 公共页面收集的超过 200,000 篇帖子。我们对帖子进行了主题建模和情绪分析，发现第一个 Facebook 帖子不仅讨论了治疗效果，例如试验结果和测试方法，还讨论了与疫苗相关的其他问题，例如批准和分发。其次，虽然这一时期的总体情绪是积极的，期待是最高的情绪，但 Facebook 的帖子表达了明显的恐惧和悲伤，尤其是在讨论紧急批准和审判结果时。最后，我们发现主题和情绪都对用户喜欢有显着影响。以疫苗分发为基准，发布讨论疫苗相关方面（例如，有效性、运输和测试）、呼吁采取行动（例如，使用口罩）并表明对弱势群体（例如，卫生保健工作者）的关怀和老年人）收到更多的喜欢。带有坏消息（例如，新病例和死亡）和对疫苗有用性的怀疑的帖子获得的点赞较少。不管它们的效价如何，接近的情绪会导致更多的喜欢，而退缩的情绪会导致更少的喜欢。我们的研究表明，为了促进行动，在帖子中使用某些主题和处理情绪可能会有所帮助。医护人员和老年人）获得了更多的赞。带有坏消息（例如，新病例和死亡）和对疫苗有用性的怀疑的帖子获得的点赞较少。不管它们的效价如何，接近的情绪会导致更多的喜欢，而退缩的情绪会导致更少的喜欢。我们的研究表明，为了促进行动，在帖子中使用某些主题和处理情绪可能会有所帮助。医护人员和老年人）获得了更多的赞。带有坏消息（例如，新病例和死亡）和对疫苗有用性的怀疑的帖子获得的点赞较少。不管它们的效价如何，接近的情绪会导致更多的喜欢，而退缩的情绪会导致更少的喜欢。我们的研究表明，为了促进行动，在帖子中使用某些主题和处理情绪可能会有所帮助。