Penelitian ini mengkaji perilaku bullying di kalangan siswa kelas IX SMPN 5 Kuningan yang masih menunjukkan tingkatan yang cukup tinggi. Latar belakang penelitian ini didasarkan pada peran penting lingkungan teman sebaya dalam memengaruhi perilaku bullying, di mana norma kelompok dan tekanan sosial dapat memicu tindakan agresif. Selain itu, intensitas penggunaan media sosial diduga berperan sebagai faktor yang dapat memperkuat hubungan ini, mengingat platform digital dapat menjadi sarana penyebaran konten negatif dan memperluas dampak bullying. Penelitian ini memiliki dua tujuan utama: (1) pengaruh lingkungan teman sebaya terhadap perilaku bullying, (2) pengaruh intensitas penggunaan media sosial terhadap perilaku bullying ,dan (3) peran intensitas penggunaan media sosial sebagai moderator hubungan antara lingkungan teman sebaya dengan perilaku bullying. Metode penelitian yang digunakan adalah pendekatan kuantitatif melalui survey terhadap siswa kelas IX SMPN 5 Kuningan. Teknik pengambilan sampel menggunakan sampel jenuh dengan jumlah responden sebanyak 88 siswa yang memenuhi kriteria penelitian. Validitas instrumen diuji menggunakan Confirmatory Factor Analysis (CFA), sementara reliabilitas diukur dengan koefisien Alpha Cronbach. Analisis data dilakukan dengan teknik Moderated Regression Analysis (MRA). Hasil penelitian menunjukkan bahwa: (1) lingkungan teman sebaya berpengaruh secara signifikan terhadap perilaku bullying (thitung = 2,238 > 1,663; p = 0,028 < 0,05), (2) intensitas penggunaan media sosial berpengaruh secara signifikan terhadap perilaku bullying (thitung = 4,010 > 1,663; p = 0,000 < 0,05), ,dan (3) intensitas penggunaan media sosial terbukti memoderasi hubungan antara lingkungan teman sebaya dengan perilaku bullying secara signifikan (thitung = 2,156; p = 0,034 < 0,05). Ketiga variabel penelitian berada dalam kategori sedang atau cukup. Temuan ini mengindikasikan bahwa semakin kuat pengaruh lingkungan teman sebaya yang bersifat negatif, kecenderungan perilaku bullying akan meningkat. Selain itu, intensitas penggunaan media sosial memperkuat pengaruh lingkungan teman sebaya yang negatif terhadap perilaku bullying. Berdasarkan temuan tersebut, peneliti memberikan saran perlunya upaya peningkatan kualitas lingkungan teman sebaya melalui program-program sekolah yang konstruktif, serta pentingnya kolaborasi antara guru dan orang tua dalam mengawasi aktivitas siswa di media sosial. Langkah-langkah ini diharapkan dapat mengurangi prevalensi perilaku bullying di lingkungan sekolah.

This study examines bullying behavior among Grade IX students at SMPN 5 Kuningan, which remains at a relatively high level. The research background is based on the significant role of the peer environment in influencing bullying behavior, where group norms and social pressure can trigger aggressive actions. Furthermore, the intensity of social media use is suspected to play a role as a factor that can strengthen this relationship, given that digital platforms can be a means for spreading negative content and amplifying the impact of bullying. This research has three main objectives: (1) to determine the influence of the peer environment on bullying behavior, (2) to determine the influence of the intensity of social media use on bullying behavior, and (3) to examine the role of social media usage intensity as a moderator of the relationship between the peer environment and bullying behavior. The research method used a quantitative approach through a survey of Grade IX students at SMPN 5 Kuningan. The sampling technique employed was saturated sampling, resulting in 88 respondents who met the research criteria. Instrument validity was tested using Confirmatory Factor Analysis (CFA), while reliability was measured with Cronbach's Alpha coefficient. Data analysis was performed using Moderated Regression Analysis (MRA). The results indicate that: (1) the peer environment has a significant influence on bullying behavior t-statistic = 2.238 > 1.663; p = 0.028 < 0.05), (2) the intensity of social media use has a significant influence on bullying behavior t-statistic = 4.010 > 1.663; p = 0.000 < 0.05), and (3) the intensity of social media use significantly moderates the relationship between the peer environment and bullying behavior t-statistic = 2.156; p = 0.034 < 0.05). All three research variables were in the moderate category. These findings suggest that the stronger the influence of a negative peer environment, the tendency for bullying behavior increases. Moreover, the intensity of social media use strengthens the influence of a negative peer environment on bullying behavior. Based on these findings, the researcher recommends the need for efforts to improve the quality of the peer environment through constructive school programs, as well as the importance of collaboration between teachers and parents in supervising student activities on social media. These steps are expected to reduce the prevalence of bullying behavior in the school environment.