This study attempts to know the students’ perception on a Facebook group in improving writing skill on the tenth grade of SMA 5 Kendari that focus on enhancing students writing performance level and the brainstorm ideas at the pre-writing stage. Also, to find out how Facebook influence the students’ affective domain. The researcher employed mix method design with questionnaire as instrument to collect data from 36 students. The data was analyzed by calculating the frequency distribution of Likert scale. The result reveals there was positive perception among students about applying Facebook Group in improving writing. Particularly, Respondent (89.7%) spell – check feature helps students to avoid the error spelling and (91.6) student feel motivated when they got “like” from their friends. It is suggested that future research to investigate the teacher and students’ problem in applying Facebook. In addition, the future study researcher may investigate the use Facebook Group in another skill of English. Lastly, the future study may investigation the use other SNS not only Facebook but it can be Path, Twitter, or Instagram. Keywords: Facebook Group, Perception, Writing