This research aims to find out:(1) the use of social media among teenagers at Al-Aman mosque in Sidoarum Sleman, (2) the morals of teenagers at Al-Aman mosque Sidoarum Sleman, (3) the effects of social media on teenagers’ morals at Al-Aman mosque Sidoarum Sleman. This is a qualitative descriptive study conducted at Al-Aman mosque Sidoarum Sleman involving 7 teenagers as the subject of the research. The data of the research were collected through observation, interview, and documentation. The obtained data were then analyzed in three steps namely data reduction, data display, and conclusion drawing. The findings of the research show that the use of social media among teenagers at Al-Aman mosque is in active category. It is proven form various types of social media used by the teenagers such as whatsApp, instagram, line, facebook, youtube and twitter. The morals of the teenagers can be classified into two categories namely Mahmudah (good morals) and Mazmumah ( bad morals). The Mahmudah morals of the teenagers include helping others, being responsible and being polite when speaking. Meanwhile, the Mazmumah morals include being lazy, riya’ (showing off), wasting time, and lying to parents. The use of social media brings both positive and negative effects on the teenagers’ morals at Al-Aman mosque in Sidoarum Godean.