Social media have swiftly gained popularity, impacting a broad range of daily decisions. Social media may be a unique channel for delivering media as platforms that allow groups and individuals to communicate with one another while also generating, exchanging, and disseminating knowledge, ideas, and experiences. The sourcing behavior of medical information is addressed in the literature. However, there are limited understandings regarding the sourcing behavior of general users. During the COVID-19 pandemic time, online information is the main resource for the general public for getting access. In the literature, the sense of credibility perceptions between traditionally offline media sources (e.g., newspapers, television) as compared to online media sources (e.g., social media, health websites) or face-to-face communication is compared. However, these perceptions can vary by factors such as how much an individual uses and is proficient in using the Internet and social media (e.g., Flanagin & Metzger, 2000, 2013; Hocevar, Flanagin, & Metzger, 2014). People are increasingly turning to social networks to communicate or seek health information, as well as to discuss their own experiences with diseases, medical treatments, and medication (Zhou et al., 2018).
It is revealed that health practitioners are increasingly promoting general health via social media. (Stevens et al., 2017). Among these applications include the development of health-related support networks, the sharing of health-related information, as well as the organizing of online health communication activities. (Moorhead et al., 2013). In the private context of gynecology, females require supports from a young age to be an adult. How the Facebook web blog of gynecology managed by a professional clinic is selected to explore in this study. Therefore, this study teamed up with a Facebook blog run by a gynecology clinic “LittleSisCare” in the city of Bangkok, Thailand (there are about 240,023 members registered in this blog). The real data of blog members are collected and a quasi-experimental was conducted between blog members and the general users. The elaboration likelihood, social cognitive, and credibility perception theories are integrated into this study and form a research framework. The quasi-experimental method is applied to examine the research framework. Data were collected from two groups: the study group (200 member subjects of Facebook page “LittleSisCare” (Thailand)) and the control group (200 subjects of general-female users). Results reveal that the sourcing behavior and the engagement behavior are different in these two groups. For the study group, the persuasive value exerted by the medical doctors or experts is high. Those referrals information sent or shared by friends has no effect on the acceptance of credibility. For the control group, users are more persuaded by the value of attractiveness, showing that the language used and the beauty of the images still affect the general population as well as the member sample. In the same way, the credibility of the content such as having a definitive reference source and the credibility of the narrative and the user's original knowledge also influences the credibility perception. Discussion and Implications for the theory and practice are given in the end.

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