The results of chi-square tests show that overall students offered more revision-oriented comments than non-revision-oriented ones among different writing tasks in either mode. Also, peer review mode affected some types of peer comments to a certain extent. There were significantly more global alteration comments and fewer local alteration comments in face-to-face than computer-mediated mode. While the participants liked comments via Word’s annotation features over handwritten comments, they felt face-to-face discussions to be more effective than online chat via OnlineMeeting due to the affordance of face-to-face talk (e.g., immediacy and paralinguistic features), that cannot be easily replaced by electronic chat. Pedagogical implications regarding the balanced use of computer-mediated and non-computer-mediated writing activities are discussed, along with suggestions for future research.