**3. Different types of health-related content**

Social media has become a powerful tool for sharing health-related information and engaging in health behaviours. Health-related content on social media can be broadly categorised into three main types: health information, health behaviours, and social support.

Health information refers to any content related to health or healthcare. This can include information about medical conditions, treatments, medications, and preventative health measures. Social media platforms like Twitter and Facebook are often used to share health information, and many health organisations have established a social media presence to disseminate accurate and up-to-date health information to their followers [41–43]. Individuals may also share health information on their personal social media accounts, either to raise awareness about a particular health issue or to seek advice from their social networks.

Health behaviours refer to the actions individuals take to maintain or improve their health [44]. Examples of health behaviours include exercise, healthy eating, and getting enough sleep. Social media can be used to promote and encourage healthy behaviours, either through direct messaging or through the sharing of motivational content [45]. Many fitness influencers have built a following on social media platforms like Instagram by sharing their own healthy lifestyle habits and encouraging their followers to adopt similar habits.

Social support refers to the emotional and practical support individuals receive from their social networks [46]. Social media can be a powerful tool for providing social support, particularly for individuals with chronic health conditions [47–49]. Online support groups and forums allow individuals to connect with others who are going through similar experiences, providing a sense of community and shared understanding. Social media can also be used to connect individuals with health professionals or other resources that can provide additional support.

In summary, social media plays a significant role in the sharing of health-related content. Health information, health behaviours, and social support are three main types of content that are commonly shared on social media platforms. By providing access to accurate and up-to-date health information, promoting healthy behaviours, and facilitating social support, social media has the potential to positively impact individuals' health and well-being. However, it is important to recognise the limitations and potential risks of social media use, including the spread of misinformation and the potential for social media to exacerbate existing health disparities.
