<![CDATA[Healthy Living Behaviours (HLB) are essential for improving public health. The rapid growth of social media provides new opportunities for health promotion through interactive, accessible, and wide-reaching information dissemination. This study aimed to analyse the effectiveness of social media-based health promotion interventions in improving knowledge, attitudes, and HLB practices among the working-age population. A quasi-experimental design with a non-equivalent control group approach was employed. Sixty respondents were selected through purposive sampling and divided into an intervention group (n=30) and a control group (n=30). Data were collected using a validated and reliable questionnaire and analysed using the Shapiro–Wilk test, paired t-tests, and independent t-tests (α=0.05). The intervention group demonstrated significant improvements in knowledge (Δ=17.2; p<0.001), attitudes (Δ=15.1; p<0.001), and HLB practices (Δ=18.6; p<0.001), while no significant changes were observed in the control group (p>0.05). Independent t-test results confirmed significant differences between groups, with the greatest effect observed in HLB practices (Δ=14.7; p<0.001). Social media-based health promotion is an effective, innovative, and scalable strategy for enhancing knowledge, attitudes, and HLB practices, supporting evidence-based public health programmes and digital health promotion initiatives in Indonesia.]]>
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