This study sought to assess the effects of social media on unplanned pregnancies among Secondary schoolgirls. The study was guided by three specific objectives: to examine the effects of social media on unplanned pregnancies, to examine problems that Secondary school girls experience after delivering of unplanned pregnancies and to determine intervention measures on the effects of social media on unplanned pregnancies among Secondary school girls. The study is hinged on two theories; Social learning theory and social cognitive theory. The study adapted descriptive survey research design. Target population constituted of 563 people but only 150 were selected successfully. That was 115 form three and four students, 12 School girls victims from unplanned pregnancies due to social media, 7 Heads of Secondary School teachers, 7 Ward Executive Officers, 7 Community Development Officers and 2 Secondary Education Officers. This was done through stratified and Simple random sampling. Data were collected through questionnaires and an interview guide. Quantitative data were analyzed using descriptive tables while qualitative data were reported in form of narratives based on the themes of investigation. The study established that access to social networking sites by students was high with much focus on sexually explicit music, sex images, videos, sex texting and student sex solicitation online and there was limited use directed to academic information. The study, therefore, concluded that social media contributed to school girls pregnancy among secondary school students in Busega District. The study recommends that the school administration puts in place guidelines and regulations on usage of social media within the schools and teachers should encourage students to use social media for purpose of soliciting information relevant to education.