HuliOpu: Yes, there is no question that people do try to use the peer review to get opponents' comments removed. We have talked to the Civil Comments developers to try to find a solution but it's difficult to resolve. If people think they see that happening the best thing is to let us know and we can step in. I don't think allowing just one comment per article is the answer, considering that an ongoing discussion (vs a single comment) is most often very interesting and helpful. But happy to hear what others think and if anyone has any ideas about how to prevent people from trying to game the system.