Abstract The aim of this study was to examine the impact of blogs and Facebook groups as effective technological tools for teaching EFL writing skills among university students. The research was conducted using a quasi-experimental design among Egyptian EFL college students at Higher Institute of Engineering & Technology Basic Science Department at AL Mahala in Gharbia Governorate to be the subjects of the research. In this design, subjects were randomly assigned to experimental and control groups. The experimental group was taught via social media activities, whereas the control group was taught in regular classroom settings. The research instruments were EFL writing tests (pre-post). The research findings were statistically examined. The results demonstrated that there were statistically significant differences between the pre-post instruments (EFL writing test) in favor of the post-test. According to the findings, the use of social media activities had a substantial impact on developing EFL students' writing skills. Finally, the research recommended incorporating social media activities to develop useful skills. It was also advised that further research should be performed about using social networking sites to teach EFL skills, listening and speaking. Key words: EFL writing skills and social media activities