This quantitative and qualitative study aims to scrutinize the effectiveness of utilizing interactive task-based activities to teach English writing in Bethlehem Secondary School for Girls. The experiment was conducted at the second semester of the academic year 2016/2017. Two scientific sections from the 11th grade participated in the study; section B was the control group and section C was the experimental one. The former group practiced writing traditionally. The students in the latter group were enrolled in two online platforms, “Facebook” and “PBworks”, to practice the target skill electronically. A questionnaire, pre/posttests, online platforms, a text content analyzer tool and self-reports were administered to investigate the participants’ achievement and attitudes. With regard to the writing skill, the results indicated that the experimental group outperformed the control one. Also, the former manifested more positive attitudes towards e-learning than the other one