Penelitian ini bertujuan untuk mengetahui dampak Fear of Missing Out (FoMo) terhadap perilaku seks bebas pada remaja di wilayah hukum Polres Batubara. FoMo adalah ketakutan dari seseorang untuk ketinggalan informasi apapun di media sosial. Metode penelitian yang digunakan adalah metode penelitian analisis deskriptif dengan pendekatan kualitatif. Data penelitian diperoleh melalui observasi dan wawancara, serta kajian pustaka. Hasil penelitian menunjukkan, bahwa penggunaan media sosial secara berlebihan akan menciptakan FoMo. Dampak FoMo bukan hanya diartikan sebagai menatap layar ponsel dalam waktu yang lama. Lebih dari itu, FoMo atau kecanduan dalam bermedia sosial membuat kita lupa akan batasan-batasan yang harus dijaga, sehingga terpengaruh hal negatif. Salah satunya menjadi pemicu perilaku seks bebas pada remaja. Menurut data Unit Perlindungan Anak dan Perempuan (PPA) Polres Batubara, Pada tahun 2019 silam, terjadi 93 kasus, di tahun 2020 terjadi 126 kasus, dan sejak awal Januari hingga Juni 2021 telah  terjadi  62 kasus. Penyebab seluruh kasus yang mereka tangani tidak lain adalah FoMo

The purpose of this research is how WhatsApp as a medium of preaching by the Islamic religious extension office of the Ministry of Religion of Asahan district during the Covid-19 pandemic. This research method uses descriptive analysis with a qualitative approach. The results obtained through this research are the implementation of communication elements in the research as follows: (1) Communicators, Islamic religious extension agents of the Ministry of Religion, Asahan Regency; (2) The message in question is a message of da'wah. (3) Communists are Muslim communities in Asahan Regency who are members of the majelis taklim or recitation groups formed by extension agents; (4) Channels, using tools in the form of microphones, loudspeakers, and video recording applications as well as whatsapp; 5. Effect, is the expected result after a lecture by the Islamic religious extension agents in Asahan Regency. In carrying out his preaching through the WhatsApp application, there are obstacles so that the da'wah is not optimal, namely: (1) Technical obstacles, smartphone ownership is not evenly distributed among the congregation; (2) Physical or organic obstacles in the form of limited internet quota; (3) Geographical location of the congregation makes signal difficult; and (4) Thought barrier in the form of different opinions of the congregation in responding to the use of WhatsApp as a medium of preaching. The conclusions obtained are that whatsapp as a da'wah medium has met the elements of communication and the implementation of da'wah is hampered by (1) technical obstacles; (2) physical or organic barriers; (3) Geographical; and (4) retardation of thought.