This study compares the impact of "open" and "anonymous" peer feedback as an adjunct to teacher-mediated feedback in a digital online environment utilising data gathered on an academic writing course at a Turkish university. Students were divided into two groups with similar writing proficiencies. Students peer reviewed papers either anonymously or openly, then resubmitted them. The lecturer provided feedback and students again resubmitted their assignments. Finally, students submitted a reflection paper on how or whether they benefited from both peer and teacher-mediated feedback. Findings provide evidence for the positive contribution of multiple anonymous peer feedback in a digital online environment towards improved academic writing skills. [For the complete volume, "Innovative Language Teaching and Learning at University: Enhancing Participation and Collaboration," see ED565011.]