This research adopted a descriptive survey design to determine the effect of social media on academic performance among university mathematics education students in three universities. The universities are Kano University of Science and Technology Wudil, Yusuf Maitama Sule University Kano, and Bayero University Kano, all in Kano State, Nigeria. To achieve the purpose of the study, three (3) null hypotheses were formulated to guide the study. The population of the study was 1,750 undergraduate students of the Department of Computing and Mathematics Education in the 2019/2020 academic session. A stratified simple random sampling technique was used to select a sample size of 350 students, using the Taro Yemane (1984) formula. A modified four-point Likert-scale type questionnaire was used to gather data. Before use, the questionnaire was validated and also subjected to a reliability test which yielded an index of 0.83 using Pearson’s product moment correlation statistics. Results showed that a large number of students in the Universities are addicted to social media. Findings show that the use of Facebook, WhatsApp and Instagram platforms would likely affects the academic performance of the University students in Kano State. It was recommended that social media should be used for promoting educational purposes, social networking sites should be broadened and new platforms created to enhance academic activities and improve students’ academic performance. It is also suggested that a one-credit course on the use of social media should be included during the orientation/induction programmes, awareness campaign and handbooks of the fresh students in the universities.