This research examines social media usage among senior secondary students in Lagos state, Nigeria. Social media usage among students has become part of the student activities, so much that it is changing the identity and attitudes or behavioural practices of several of the senior secondary school students hence the need to look into the advantage, positive impact and the disadvantage of it to the senior secondary school students who are mostly teenagers and youth. Based on these papers, it is recommended that parents and teachers should monitor and supervise the activities of their children most especially in the areas of internet and social media usage. Social media which is an important product of Computer and Internet Technologies has a growing usage level day by day. Increasing social media usage level gives opportunity for new software developments and making investments in this area. From this aspect, therefore, social media has not only economic function but also make persons participate in social life. Furthermore, it also provides opportunities for undemocratic actions and operations as in terms of democratic society life. Identifying users’ habits has an important function on determining economic, social and cultural effects of social media. From this perspective, this research aims to determine social media usage habits among senior school students, thereby pointing out the benefits, positive effects and the harm done to the students.