Improving the Comments block

1st time poster here. We building a Twitter web app that puts your tweets in images. Being a very social product, commenting is important to our (future) community. I am looking closely at our comment blocks and noticed that everyone uses the same layout so that lead me to experimenting on how to improve comment participation. I am doing one with our product (http://twidl.it - private alpha this week). Two columns - comments form (left) and the comment form (right). the (right) comment form which is small since characters are limited to 140 characters. The (left) comments column has the comments in floating blocks, this makes short comments show in a single row. I am anticipating short comments since the post only contains a tweet and a photo. My copy is "Add new Comment' with a dynamic comments block header if there is 0/1/more comments. Anyone see new experiments in comment forms?