Social networks are becoming an integral part of people's lives. Students are spending much time on social media and are considered the largest category that uses such application. This study tries to explore the influence of social media use, and especially Facebook, on high school students' performance. The study used the GPA of students in four courses and their responses regarding the use of social media. Statistical analysis is used to infer this relationship and its implications. Results indicated a support of this study aim and the relationship between the different dimensions of Facebook influence on students with respect to the time spent on the Internet and Facebook specifically. Conclusions and future work are stated at the end.