Blogging movie reviews

My seventh grade language arts students are currently writing movie reviews, while addressing the concepts of bias and persuasive words. As I looked for reviews for them to read I noticed that many movie websites now have a blog attached for viewers to add their own comments to the critics' reviews. I would like to have my students include part of their review on a blog and then interact with others as they receive comments. This would enhance our goal of publishing their work--making it viewable to others--by letting them see and respond to the people who have viewed and commented on their original review. This would also be a good opportunity for them to use more persuasive techniques in their writing as they try to convince people with a different opinion from theirs.