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This research aims at measuring the effectiveness of learning set using social media in improving students- communication skill in the topic of fluids. This is experimental design research using One Group Pretest-Posttest, using Project-based Learning model. This research is a part of Research and Development (R & D); the ADDIE learning set developed consist of syllabus, lesson plan, materials, LKPD, test, and evaluation instruments. This research takes place in MTs. Negeri 1 Kota Gorontalo, using 25 students as the sample. The result of the data analysis shows that the average communication skill indicates a significant difference; the N-Gain is in high category of 0.72. Therefore, it can be concluded that the learning set using social media is effective to improve students- communication skill in the topic of fluids.