This research aims at measuring the effectiveness of learning set using social media in improving students’ communication skills in the topic of fluids. This is experimental design research using One Group Pretest-Posttest, using a Project-based Learning model. This research is a part of Research and Development (R & D); the ADDIE learning set developed to 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 skills in the topic of fluids.