I stopped comments on PBFluids a number of months ago as the quality of comments fell in parallel to the rise of twitter. By the time I stopped comments I was deleting 40 comments for every one that was productive.

Dear Josh95,

The New England Journal of Medicine would like to thank you for posting a comment on our blog. We here at NEJM are enthusiastic about new media as a means to interact with our readers, and we appreciate your eagerness to participate in this exciting new form of scholarly discourse.

However, the peer reviewer we assigned to your comment has expressed some concerns. Since the blog entry you commented on was an original research article dealing with medical oncology, we have assigned a reviewer with a similar expertise to your comment. You will find a copy of the reviewer’s remarks below.

— McSweeney's

Maybe if I used a peer review system I could increase the quality of comments.