The objective of the present study was to investigate the effect of Facebook use on writing achievement, writing attitude, writing anxiety and writing self-efficacy of the students in the written expression course. In the study, pre-test post-test quasi-experimental design with study and control groups was used. The experimental group included 96 students attending Psychological Counseling and Guidance Department in the Faculty of Education in a state university located in western Turkey during 2017-2018 academic year fall semester. In the study, the written expression course was instructed with written homework assignments in the control group and by sharing the written assignments on Facebook in the experimental group. The study findings demonstrated that Facebook use produced better results in terms of writing achievements and attitudes when compared to the conventional method, however the impact was not significant in terms of writing self-efficacy and writing anxiety.