<![CDATA[High internet penetration among adolescents is frequently unaccompanied by adequate digital literacy, triggering vulnerability to misinformation, cyberbullying, and excessive personal data sharing. This study aims to evaluate the effect of digital communication ethics education on social media usage knowledge among students at State Senior High School 1 Sukoharjo. A quantitative approach utilizing a pre-experimental one-group pretest-posttest design was implemented involving 33 respondents selected through purposive sampling. Data collection utilized a closed questionnaire containing 15 items, while comparative hypothesis analysis was tested using the Wilcoxon Signed Ranks Test. Statistical analysis results demonstrated a significant increase in students' average knowledge scores following the intervention, with a significance value of less than 0.001. The effectiveness of this intervention was confirmed by the dominance of score improvements across the respondents. In conclusion, the digital literacy educational program proves effective in expanding adolescents' cognitive insights, serving as a crucial preventive instrument to establish a safe cyber communication ecosystem within the school environment. Keywords: digital communication ethics education, knowledge, social media, adolescents, digital literacy]]>
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